No idea. I think I understand German enough, but I have only seen the first video (at the bottom). My impression is that it's some youtuber who creates content about retro games, and is speaking of a videogame cartridge edited by dragonbox.de, or at least with its logo.
At the beginning of that video the man thanks his partner dragonbox.de for making the video possible. So from the outside it seems like dragonbox published a product, and somehow payed or helped an influencer for a review. But I have no idea (nor interest) of youtubers, videogames, the dragonbox business or marketing in general, so I might be totally wrong. I don't even remember for which console the videogame was. Sorry but it's too boring for me to watch more videos to find out better.