They’re all surrounded by controversies, so obviously you shouldn’t use any of them as your main browser. However, using a shady browser for nothing other than watching YT with a specific account mitigates the privacy issues to some extent. Due to the annoyingly sandboxy nature of iOS and iPadOS, normal spyware isn’t going to be able do much there, so I wouldn’t be too worried about that. If these apps pull some real exploits to get to my data, that’s a different matter alltogether.