First they would try to block it on the ISP DNS servers. But this is easily circumvented if you know how.

My guess is he is just throwing out stupid ideas without knowing how to get them implemented.

My guess is, that Meta will try to control the public image of the name Mastodon. Yeah the Software itself is OpenSource and protected under AGPL-3, but they still can buy Mastodon GmbH and use that to tie their name to Mastodon for the broad public.

Have a look at an nvme ssd and an enclosure for it. I’m using a icy box one for mine. This way you can get 2tb storage for about 130€. There are a ton of options regarding enclosures. If your budget allows you should get two for additional backup security.