Yeah but this is a general problem that ActivityPub has, it builds on the goodwill of the people/instances.

But I don’t think it will be a really big issue, if there are really just a few of these instances (that is the premise though) But it’s a good point, when something like this is open source, and anyone could spin it up to kinda DDOS the fediverse…

But when looking at it in more positive light/good will, it could probably also be used as an intermediate cache/index instance for other instances, which may save requests to the original instances.