They should at least consider the possibility. Go in with open eyes, so to say.
This story comes to mind:
https://www.extremetech.com/mobile/239728-google-suspends-ac...
If this happens, even more people will take their eggs out of Google's basket. I've already migrated my email to another provider and use Searx[1] for search.
If you do use it, please don't violate the TOS, because it increases the chances you'll screw it up for everyone else (me). People who violate TOS are why we can't have nice things.
What's the difference between downloading and streaming a video? It's OK for the bytes to stay in main memory/network cache, but not in HDD? Would taking a memory dump of the RAM break their TOS?
"It's my own right to save those packets(without re-distributing) them and watch them in any form I like."
YouTube lets you rent movies for 48 hours.
You download a movie. You then claimed you can watch the movie in any form you like. Such as, later than the 48 hours.
OP claimed, "It's my own right to save those packets(without re-distributing) them and watch them in any form I like." That is not accurate. He doesn't magically GAIN COPYRIGHT over content, just because he downloaded it. His use MAY be covered by Fair Use Laws, but it may also still be a violation of YouTube's Terms of Service.