Watching a YouTube video and downloading a YouTube video are the same thing. They are indistinguishable. You can not watch the video without downloading it. Just normally you dont keep the file but each part of the video is discarded a few seconds after you watched it. I dont think YouTube ever went after users who watched pirated content, they only ban the channels that upload it.

Your ISP or law enforcement only see you are watching YouTube. They dont know which video and they dont know if you save it or not.

AMD is no problem. Only nvidea (of the big mainstream hardware manufacturers) does not supply Linux drivers.

In fact AMD will most likely make it easier than Intel if something doesn’t work. Intel pretty mutch only thinks about Winows, so if there are driver problems, there are only windows drivers to download on their website (but there shouldn’t be an problems in the first place anyway)