It's true. The megacorporations are actively blocking communication between human persons because it increases their profit and the rules don't apply to them. But this doesn't mean you need to roll over and just take it. The benefits of hosting your own email far outweigh the problems of delivery to some megacorps.

>self-hosting email is an anachronism of a simpler internet. The good old days. They are long over.

This is only true if you are being paid to run a for-profit business or institution. For human people acting in their own interest the fight for free communication is far from over.