Do you think Lemmy and other parts of the fediverse will eventually enshittify? I think this would be an interesting discussion to have. There currently is not financial incentive like the ones that have led centralized platforms to enshittify. But there might be in the future. Does decentralization protect against that tendency in some way?
Lemmy and Mastodon do give me the hope, that when one platform turns to shit, there will be people creating a platform that - for the time being - is not.
There are proxies for activitypub, they’re not used for anything good though, mainly for evading defederation, look up activitypub-proxy and activitypub-troll for some examples. Not saying a proxy for it couldn’t have some good use, but by in large many are used for the purpose of trolling, spamming, and being malicious in general.