There's a bunch soliciting guarantees. As part of fediseer, it falls on all of us to maintain it. So please check the new instances and guarantee for any that are not spam (which should be most).
Click this link to guarantee for some instances
Also reminder if you're the admin of an instance requesting a guarantee, by specifying who should be your guarantor, you will send them a PM to ask them.
here you go: https://fediseer.com/faq/eng#what-is-a-guarantee
wow, very interesting concept, thanks for sharing