Don't fill in this field, that turns your instance into a whitelist server. Remove everything from the allowed instances list

If you leave your allow list blank it federated everything. I'd leave allow list blank and block specific Instances instead

This is from my own instance so I guess you might not see it.

Are you saying you only allow-listed certain instances? Federation is on for all instances by default, you don't need to enable federation for each remote instance in the admin panel. Remove everything from the allow-list, add any thing you don't want to see in the block-list and all those little instances should start appearing.

This is more of a support question - please take a look at the sidebar for good alternatives where this question would be a better fit.

If you want it all, you have to federate every instance.

Sorry for that, I don't think there's any way around it

I'm not sure that what you're saying is correct. I don't follow anything from those two instances, yet I see their comments.