Cat videos aside, I did read that Netflix and Amazon Prime would be reducing their bitrates on HD and UHD movies (in Netflix's case, halving the rate of UHD from 15.25 to 7.62Mbps). They said they're doing this to 'help' people by reducing the load on internet providers to help Britain 'keep working' (or some such nonsense) as usage of these streaming services increases because people are at home. I found out later that actually Netflix and Amazon have costs associated with streaming, and they pay by the GB. They were probably concerned that their costs might increase by more than the number of new subscriptions.
So they're not doing this to help anyone, they're just looking to help themselves and reduce losses.
Anyway, all I can report is that the loss is really not visible with Netflix, either with UHD or HD movies. You don't see quite as much high-end detail in Netflix, but it's still very good. However, I've noticed that HD movies in Amazon Prime have lost so much quality that you see low-resolution artefacts and it's quite distracting.