Copyright of code doesn’t work that way. Now if some idiot goes and uses that code in a game, yeah, they’d have a rough time in court.
If Nintendo thought there was infringement already, and wanted to prove it in court, there are means to securely prove it with redactions and NDA’s and so forth as it would be considered trade secret.
I mean, you can use custom search engines, but the only way to get them on android is to sync them over from a desktop install.
It’s such a strange kludge, especially if you a) don’t use desktop vivaldi or b) don’t use sync. Maybe one day they’ll add in the menu item or whatever. It’s getting better but Android Vivaldi has been getting like one new feature a year it seems like.