Glad it worked. It looks like its for getting the big stuff while communityboost is designed to help find the small.

From the way I read it, you create a user for the tool so when you submit your instance, it can run on your instance. One of the users chosen at random is here https://discuss.tchncs.de/u/communityboost

You can read a discussion about it here https://pawb.social/post/4136386

I also came across https://github.com/Fmstrat/lcs

Edit: Looks like https://sh.itjust.works/u/iso might be the user behind it.

There is a tool I’ve heard about that subscribes to remote communities for federation until a real subscription. https://boost.lemy.lol/