It scales in and out. When it does it though its fairly blatant. It's so hot and cold for people. I've had a few perfect games but remember the Newcastle game 2019 when they had an entire day's fixture list on Prime, quality wouldn't budge and was what you've described. Blurry or as I remember it basically 480p.
If they intend to be a serious player then that's just not good enough. But I doubt their intentions. The fixtures they pay for all seem to be to bring traffic in for the festive period, onto a platform that sells things.