

Not sure about the current situation. However in general Twitch uses server side injected ads (SSAI), which are basically unblockable. They can however be bypassed (using different methods, each having it’s own pros and cons). Anway there is a very active twitch ad blocking community that will explain everything: https://github.com/pixeltris/TwitchAdSolutions Most reliably is having either an http proxy or a vpn in a country that is not served ads.
Well you have your “home” lemmy instance which you are logged in to. Everything you see goes through your home instance. But many things you will see originate on a completely different “remote” instance. Your home instamce nees to be federated and synced in order to the everything that happens in the remote/origin instance