Lemmy is still very niche so it’s mainly populated by a specific type of people. That is normal and the same for every platform that starts small and grows slowly (reddit, instagram,…). If you want to see different content you can create your own communities or if they are not allowed even your own instance. But Lemmy still has to grow a lot to attract “normal people”. They are still on reddit at the moment.

By the way which censorship are you referring to that could not be resolved by moving to another instance?

How would key signing prevent deep fakes?

Lemmy.world is not frowned upon. There are some people who are very vocal about not liking it but if you don’t have any problems you don’t need to change. There is also nothing stopping you from having accounts on diferent instances so try some of them out and stay where you like it.

The point of the fediverse is to give people the option to create communities by themselves and not be subject to the ruling of one central allmighty entity. If someone does not like one community they have the chance to create their own with their own rules. This means people can decide for themselves what content they want in their community. However people coming from traditional social media seem to mistake this kind of freedom with not needing to follow any rules but that’s not how it works.