Mint used to wholesale bandwidth from T-Mobile but was taken over by T-Mobile. They're offering 5G data (hotspot I think, called "Home MINTernet") for current phone customers, $30 / mo. If I thought it had an RJ45, I'd actually consider it for upstairs.
We'll probably see more of this kind of thing. I saw my first ATT ad on something I was streaming, just yesterday, first such ad I recall seeing in years.
I had to get t-mobile after i lost my starlink access. No other options. It’s okay but we do a lot of streaming and I have a ton of cameras and other devices I like to access remotely and it can’t come close to keeping up.