Nostr is an open protocol. Plenty of questionable people have contributed to Linux, I still use the OS. Tor was made by an alleged rapist. I still use Tor. Open protocols are sometimes used or made by nasty people. Lemmy and email are "censorship proof", they are both good protocols. Lemmy used to be 100% annoying tankies, but as it grew so did the diversity of the userbase. Nostr is going through the same thing.
You choose who you follow, so you choose who ends up in your feed. For the "public square" areas (trending tweets etc), relays set their own moderation policies just like lemmy, that feature is identical. Find a relay that suits your moderation preferences. Most nostr apps can automatically filter out anything related to crypto/nsfw/politics/other less popular topics and prompt you to do so. If something slips through you can easily click ban and move on.
Tips are a cool functionality. On one social network, content creators don't have an opportunity to get paid for the content they post. On the other they do. Which one do you think will attract the most content creators? My bet is on the second. I like being able to send tips to people who write good posts. But it's an optional feature, you don't have to use it.
There are many open source wiki softwares: zim, dokuwiki, etc.