@SusanLewis I think you're missing the point. Because Mastodon.social has positioned itself as the "default instance", it's attracting the spammers. They won't go to smaller instances because they will get stopped immediately.
But right now, Mastodon.social is the loud neighbour throwing parties at 4am of the Fediverse and smaller instances are increasingly coming to the realisation that its' easier just to completely cut it off.
Right now, you can still move, but one nasty side effect of de federation is that you can't port to a server that's defederated you.
If you pick the largest instance you can find, then yes, this problem may well follow you. If you go to a small instance, which is how things are supposed to work anyway, it won't.