I don't think it a large proportion; the vast majority of users are on a few large instances such as Mastodon.social which are not via MastoHost. The owner also

I don't think it a large proportion; the vast majority of users are on a few large instances such as Mastodon.social which are not via MastoHost. The owner also stated he would not want to host more than a 4th of all instances https://masto.host/the-25-percent-commitment/ https://masto.host/the-25-percent-commitment/ We will likely migrate to our own cloud setup once size gets stable.