On CWs, I go by:
Am I OK with my grandkid seeing this in passing?
Of course, I'm an old freak, and my kids are also very much not run-of-the-mill, and well travelled, so I imagine any hypothetical grandchildren would be widely experienced, so to speak.
Still, if I didn't want them to (see/play with) something, I'd put it up.
Same thing with a CW.
Oh! I also use the CW format to set up a visual punchline:
"This happened."
<click>
unexpected image of what happened