True. And they might close your account if you login.
How I display, download or request data without an account and which browser or app I use to do it is still my choice. I'd guess if they could do anything about it, they would have half a year ago. The only way would be to DRM/widevine all videos and apparently they aren't ready for that yet. If they block my IP I'll just get a new one.
I wouldn't even be thinking about using a 3rd party app or blocking the ads if their service was reasonable. No way I will endure that, if they block it I'll just watch something else.