There are a few, but they all require Twitter API access (added cost).

Ah right, of course, AI advancements mean all the APIs cost money now.

Do you know of any companies offering fediverse hosting services?

There are some, like https://masto.host, but that’s not really the kind of thing i was suggesting.

This could be controversial among the diehard FOSS folks (and does pose an embrace-extend-extinguish risk), but it could also be a way to onboard more mainstream organizations who don’t want to deal with hosting themselves.

I didn’t think of this. If a company sets up an instance and starts posting their updates, other instances may well defederate them as spam. Like you say, you could onboard more mainstream organisations, but many Mastodon users are likely to think this is not something we should aim for. Your link also mentions that accounts that mirror twitter posts are generally not well received, so maybe it’s not the best idea.