OK, so I've found out about this today, but this is probably the best way to remove the iCloud activation lock, it doesn't remove it completely, but it can give you a way to contact the old owner, or even use youtube, play some games listen to music etc.
https://iclouddnsbypass.com/ -> this is the website of the bypass
https://iclouddnsbyp...ass-dns-server/ -> instructions
And this is the video tutorial:
I would write more about it, but I'm too lazy to do so currently, I just wanted to share this with people who weren't aware of it.
Be sure to watch the whole video, because it shows you 2 things:
1.) How to watch youtube, play games etc.
2.) How to get to the home screen and get a hold of the email address of the old owner, or his phone number.