

So how do I do that? How specifically do I find a youtube login cookie? I tried searching, but could not find any useful guides.

When I look in Dev tools in firefox I see a big pile of nonsense. I guess what would be really useful here is an installation guide with actual screenshots and detailed instructions. The instructions provided assume a lot of background knowledge that most people will not have.
Sure I could just log in, but I also don’t want to trust my log in details to a random program I download.

I think the bigger concern is someone uploading CP to it and then maybe having your house raided by the cops. Even if you completely separate your personal files from the lemmy server, the police are just going to seize every computer in the house. And the fact will remain that they found CP on your computer. The burden of proof then falls on you to prove that it wasn’t you who put it there.