I think the current issues with spammers from mastodon.social highlight a couple of problems:
1. You have to screen your users before they post and keep an eye on the creation of multiple accounts with similar profiles.
2. We may have an issue with people mining the Fediverse for data - I suspect there are not enough tools to protect users from bad actors.
3. Decentralization is good - concentrating a majority of users on a single instance means painting a big target on that server. [1/x]
I agree fully, with all this action, and pre-emptive action, we are learning and developing our knowledge and understanding, so we can work really well together to develop solutions, one size won't fit all so we can develop a range of solutions that will work in different situations.