I think Vercel has a form of this, I think if you want to spend <$20, you can buy your own domain, and use Vercel to have infinite subdomains. I purchased mileswk.com for around 14 dollars a year. If you want, I can create a tutorial on my blog from the buying process (I used domains.squarespace.com) to setting up subdomains.
Short answer: They won’t tell us:
Maybe because they aren’t removing the support forums. Now, that really doesn’t do much if the think they have the forums for are going away.