Communities can defend against bots using captchas, minimum karma limits and whatever else they can think of. We're constantly improving this aspect.
People can make up Communities and purposely fill them with bots and astroturfing, however they can already do this on your typical social media. Its upto the user to spot this and move to a better community. We of course will do what we can to discourage astroturfing.
In terms of monetisation and building it around NFTS. All of that is optional. Communties can choose to only allow users to have NFT profiles or allow them to have whatever image they want. The tipping is optional. The domain name is a valid point, however its the most decentralised, non censorable option. We intend to allow domain names from different blockchains so if games.eth is taken people can use games.Sol.
About your point concerning community splits, this sort of thing happens in reddit all the time. A few communties get created in the splinter but eventually everyone moves to the one with the most activity and decent mods. And as we said we will facilitate the best ran subs gaining prominence from our side by adding it to the recommended list.
In terms of monetisation, the dev has spent $600k of his own money on this and is still spending. He doesn't care to make any of it back. Plebbit is a non profit company. Any money made from plebbit via pleb domains or donations or plebbit gold will go to funding devs or other aspects of plebbit, but profit isn't the goal.
The internet sorely needs a fully decentralised social media. Most of the social media has been taken kver by corporations, speech is stifled, what you see is controlled by shady algorithms. Plebbit gives all that control back to the community. Lemmy is a good stepping stone, but Plebbit is the end all be all. Improvements are always happening but a P2P social media is such a simple yet novel idea its surprising its not been done before.
They pay the devs via bounties and meeting milestones.
We tried iroh but it wasn't fit for purpose. We have tackled the moderation exactly how you've described it. Allowing multiple people to control a community. We're in the process of implementing it. Our version of this allows people to create multicommunities where it shows similar communities in one sub.
Activity pub would be interesting but plebbit is so technologically different were not sure it would be technically possible. We forgo the concept of instances entirely allowing Plebbit to work closer to Reddit, where you just search a sub. Global admins don't exist on Plebbit. Subs can still share ban lists if they wish but its optional
Plebbit is always looking for new devs, join our telegram group @joinplebbit to discuss with the main dev about joining the project.