That's a surprise! I totally thought it was a dedicated company that was doing it so. As I mentioned I got the official repairing kit of iFixit :D I'm excited about it. I came first to iFixit because I trust the website and the tutorials there provided. I didn't know it was done by users as well.
Although that's also good.
Nevertheless GoPro 7 is an old camera so maybe it doesn't even make sense to repair it, anyways.
Thanks for the answer. Cheers!