I always manually changed

https://www.youtube.com/watch?v=RdIB6UUs7aI

to

https://www.youtube.com/embed/RdIB6UUs7aI

because I dont wanna login to google services.

Some days or weeks ago google disabled this. So now I'm looking for a new way to bypass.

Login or installing software like youtube-dl is not an option because I really only watch a few age-restricted videos per year.