So #WIIFM kills #FLOSS twice: once (on the author side) by removing an incentive to sharing one's work, and the second time (on the user side) by giving a sense of entitlement for something one is _not_, actually, owed.
The #WIIFY mindset, OTOH, promotes both #FLOSS production (as adopted by the author) and responsible usage (as adopted by the user).

Now that #FLOSS is taken for granted, and users don't ask anymore #WIIFY of the developers, but only care about their own #WIIFM, #FLOSS development has become a stressful, negative experience for the authors of projects that reach any amount of success and notoriety, as they get flooded by entitled demands for assistance and feature requests, with no expectation of compensation for the work they would have to put in beyond their own personal interest.

Now that #FLOSS is taken for granted, and users don't ask anymore #WIIFY of the developers, but only care about their own #WIIFM, #FLOSS development has gotten a stressful, negative experience for the authors of projects that reach any amount of success and notoriety, as they get flooded by entitled demand for assistance and feature requests, with no expectation of compensation for the work they would have to put in beyond their own personal interest.

Now that #FLOSS is taken from granted, and users don't ask anymore #WIIFY of the developers, but only care about their own #WIIFM, #FLOSS development has gotten a stressful, negative experience for the authors of projects that reach any amount of success and notoriety, as they get flooded by entitled demand for assistance and feature requests, with no expectation of compensation for the work they would have to put in beyond their own personal interest.

One of the best examples of how damaging and schizophrenic the #WIIFM mindset concerns #freeSoftware and #openSource. One of the strongest reactions against #FLOSS, before it became well-established, was the skepticism about the possibility that people may be giving their work away for free —there must have been a trick somewhere, for it would be unsustainable for software to be given away this way: there would be nothing in it for the developer. Why would they do it?

To see the difference, consider the case of social networks. «cui prodest?» can always be spun into a #WIIFM, something about you benefiting from having a place where you can communicate with your friends without paying anything, and be shown additional content that may be relevant to your interest».

Now try asking «what's in it for you?» to your instance admin versus any “Big Social” and the difference is quite clear.

To see the difference, consider the case of social networks. «cui prodest?» can always be spun into a #WIIFM, something you benefitting from having a place where you can communicate with your friends without paying anything, and be shown additional content that may be relevant to your interest».

Now try asking «what's in it for you?» to your instance admin versus any “Big Social” and the difference is quite clear.

Libertoloids like to think that the #WIIFM mindset on which the modern individualistic society is founded is the path to freedom, only obstructed by the evil “communist” State (or government; they're very confused on everything, including the difference between the two, or what communism even means) with its monopoly of violence.

They're useful idiots to those leveraging everybody else's #WIIFM mindset for their own personal gain —State or no State.

There's a reason why #WIIFM is so eagerly cultivated in modern capitalist societies: it makes people easier to manipulate. It's the cornerstone of the _divide et impera_ that defuses corporatism among the less fortunate, and trains people to prioritize short-term gains for longer-term security.
(And yes, you'll notice that it's the opposite of many cautionary tales of old.)

In fact, even the #WIIFM mindset being mostly contrasted to some assumed sense of self-sacrifice for the greater good of everybody (else) is essentially a propaganda strategy to empower WIIFM. And yes, this is done on purpose to distract from the fact that overcoming WIIFM doesn't mean self-sacrifice, but rather the inquisitive question: «what's in it for you?» (#WIIFY)

The #WIIFM mindset is difficult to overcome.

It's a mindset we're born with, because a baby's focus on themselves is essential for their survival.

We have to _learn_ not to egoize (may Ursula K. LeGuin forgive me for appropriating her choice of words).

Instead, for the last 5 decades if not more, most of us have lived in societies where the #WIIFM is being actively cultivated.