Nothing is preventing an instance catering to any or all of those from being created, but that instance could be defederated by other instances who don't want to support that content.

I used to use Google Domains, but lately I've been switching to Cloudflare. They don't have every TLD, but they have all the ones I need, and their prices are lower than Google's is.

Are there any plans to allow users to define a custom Lemmy/Kbin instance without needing to edit the script to add the instance URL? (is that what you meant by "better rewriting support for kbin community/user urls"?)

That's fantastic, thank you!