Yes, I know this. But it feels overkilling to host a server which is capable of hosting thousands of users just for me alone. I'd like something small, dedicated just for my own usage. Kind of a way to have my RSS feed discoverable and commentable.
I run my own Mastodon instance and it's definitely heavy and unoptimized for this use case. That seems to be a common theme with Ruby on Rails applications, to be honest.
There are lighter clients that will integrate perfectly into Fediverse/Mastodon networks, though, such as GoToSocial (https://gotosocial.org/) with its light and low-tech UI.
Many Mastodon alternatives expose a Mastodon API so that you can use the standard Mastodon apps with them, even if you're not really hosting Mastodon itself.
Modern software deployment methods can fill the gap between your selfhosted need and the work to be done. I won't name technologies here, because existing have its flaws (docker, helm, etc).
Mastodon is federated and thus basically fulfills your whish. IMO "decentralized Web3" such as IPFS may rempve that need for classical "hosts" but at the costs of an entrance barrier for users (have to install that client).