I never had this happen to me I guess this is because I do research and take precaution on various technology.
I think the key to this would be to use the flash light less frequently and lesser times.
If you have no reason to leave the flashlight on for hours, don’t. Don’t flash it on and off again rapidly, the worse thing you can do to an led life cycle, you’l likely blow out the light which I know people to do carelessly before with light switches. Really, for the life cycle you should only use it if you need to and find any means to not have to use it and the life cycle would be more unlimited rather then limited. (although still limited technically)
Some Lemmy apps do allow you to block posts by keywords. But this isn’t built into the account itself, just the local app filter.
On Mastodon, they do actually let you filter out posts by keywords and it syncs with your account. No matter what device you use or switch to it will remember your filter settings.
I don’t think one person should decide for everyone on the whole Fedi, what people can see I would argue to leave this to specific instance moderators. The instance moderators themselves should be able to filter out words, and also what terms they filter out for everyone absolutely must be transparent so users know what is filtered out on a server by server basis