Tariffs: A list or system of duties imposed by a government on imported or exported goods.
You provide a service, not goods. You will be unaffected by any tariffs.
Centralization is a weakness. These services can be targeted by governments that want to limit communication. Free speech is a commodity, and servers host this free speech. If a hostile organization, such as a government, targets a channel of free speech such as those hosted on a platform that makes it easy to setup a mastodon instance, this become an easy target that will affect a large portion of users. If you are serious about freedom, you have the freedom to self-host your own platforms.
Edit: I realize my post doesn’t answer the question proposed, but it’s more of an argument against such services. I would argue self-hosting doesn’t rely on paying third-parties to host your software, but I guess this is in the eye of the hoster.
Hopefully we stop relying on these corporate journalist cause “journalism” is bought and sold at this point. Where are the independent journalist? I think we need to start looking towards a platform to fund people who seek the truth, cause every established modern outlet seems to be selling the same shit.