I'm guessing some might have downvoted because I mentioned paid providers. As in letting you pay them to run a Mastodon instance. While the above poster seems to have read my "and more are sure to come" as more options in general rather than more paid options. But I didn't downvote as I agree, the promise of Tumblr support is a big deal and will be a good option for a lot of people.

I know that's not what you meant but Tumblr is not free like your friendly neighborhood Mastodon instance or a foundation instance, it's for profit and paid for by advertisers and via paid features.