I’m pretty sure Adguard is more than just a browser extension. They have an app for many different OSs, which I think makes setting up their DNS ad blocking on your devices easier and simpler. There’s also Adguard Home, which is similar to pi-hole, if you want to self host a DNS ad blocker.
They also offer a VPN.
So you aren’t paying just for a browser extension necessarily.
Sakurajima has a Mastodon and a Sharkey instance. Both very much aimed at Japanese culture and related stuff. This should hit your anime requirement at least.