I think some people are misinterpreting 100% as "even when you aren't on a call/Zoom/huddle" which is batshit.

Some people are just unhappy they're being called out for taking meetings while they take a dump.

The latter is precisely why attempting for 100% cameras on during meetings is a good idea. If you're uncomfortable being on camera in a meeting doing it, its a good sign you shouldn't be doing it.