Conclusion and recommendation:

As of this writing, [ communick - Matrix ] is the only provider worthy of consideration by individuals who want to create an account to use to access the [matrix] system. Opening an account with them will cost you about $2.50 USD / month, after a free trial period. We receive no payment or other compensation for making this recommendation. We use them, and we found them the hard way. Their server seems to be reliable and they are easy to contact for support.