It’s $300 less, not $300 more.

No matter how much you are paying, you can afford to pay $300 less.

A discount of $60000 is not “nothing at all”. At current rates, it’s about $300 off your monthly payment.

Just google “foreclosure auction” in your area. Those houses will generally sell below market.

Nothing in ActivityPub says you can’t move your content from one platform to another.

Your content in ActivityPub is linked to the home instance. So for example I can’t move this post from lemmy.world to another server. I could copy/paste the content into a new post on another server, but it would be a broken piece of our conversation with no context or replies.

Also, hosting a ATProto self-instance is not as expensive as you suggest. This person did it for $150/month.

Regarding the alleged missing features of ActivityPub

There are significant differences in account portability. ActivityPub allows you to transfer your followers to a new server, but not your content.

only rich folks or those who are willing to accept money from venture capitalists

Or non-profits that are willing to accept money from supporters.

ActivityPub already existed when they started BlueSky. They chose to not make their protocol compatible.

Because AT protocol has features that are incompatible with ActivityPub, and those features are important to some users.