not much
If you only access your local domain name inside your LAN and via VPN you can also use Caddy to have local SSL certificates https://caddyserver.com/docs/automatic-https#local-https Have not tried this myself yet but I like the idea of not getting any warnings in browser, and this is safe as long as the Caddy CA root certificate is safe.
Kind of agree. Though there is pi-hole and several others. And there’s i2p, Freenet (now called Hyphanet) and GNUnet, and similar.
Yes and no. Code development for Nitter has officially stopped afaik, but there are still some instances not completely dead.