ZapStream uses a vide range of nostr events not only zaps. Everything no nostr is native and you can already embed notes, goals, emote packs and other things directly into ZapStream's chat instead of sending viewers from one site to another to a third site to view nostr content.

Is it censorship resistant? Yes and no. You can run your own server or connect through cloudflare or you can use the hosted solution provided by ZapStream but even ZapStream has some ToS. So if you receive a DMCA then ZapStream has to act on it because you're breaking the law. Outside of that it's as free speech as everything on nostr - minus Primal lol