fair. but I'm assuming you need such expensive (and as a result, centralised) services regardless. a small part of content discovery is "who has reacted to my content", take the case of tiktok, in which a strong content discovery mechanism helped it soar through the ranks. I suspect without such a mechanism the system won't succeed either way (as the fediverse is suffering rn), so its a problem that we will have nevertheless (same as the problem we have with search engines).