Right, lots of people have felt depressed too. That doesn't mean they've got clinical depression. It is clinical when it is so extreme that it impacts every facet of your life.
Think of it this way: lots of people can't see well, but not seeing well doesn't mean blind. If you don't see well you can improve your life by wearing glasses. If you're blind glasses aren't going to help. The whole way life functions revolves around dealing with being blind. There are all sorts of things you'll need to do to cope with blindness that people who aren't blind, or simply don't see well, don't have to do or think about. So it isn't quite right to equate not seeing well to blindness, even if people who don't see well can imagine what not seeing at all might be like since they can partially experience not being able to see.
Well, the big issue here is that we sort of don't have the power you think we do.
What I mean is, say you have 10 servers. 7 are Lemmy, 3 are kbin. Great, each admin has control over those servers. Then you have Meta. They'll run 1 huge server. When the 10 other servers enable Federation, Meta now has 10 servers of content that isn't even on their own platform that they can sell. Your data will literally exist on the Meta server because your data is not contained within your instance/platform once it's Federated. Meta can then harvest the entire Fediverse for data like this. It's like an absolute wet dream for them. They don't even have to coax people to use their own platform!
Meta must be defederated the second they so much as dip a toe into the Fediverse or everything you've ever done, or do, on any ActivityHub platform will be scooped up and sold.
Edit: And it's even worse because all it takes is 1 server to Federate with Meta. If server A is Federated with your sever B, Meta can sill pull your data from server A they Federated with, even if your local server B has Defederated with Meta. This is a huge problem.