Well, on the one hand it should help separate the wheat from the chaff - the serious producers who really think they have a shot at a pro release from the newbies who go around sending demos of unfinished stuff (like I did back in the day). It will make it easier for GO to pick releases because there's less boring demos, and he'll have much more time for other stuff - if he manages the label himself completely. And also, it will get him some straight cash, which will definitely help in times of the pandemic.
Of course, he has the choice to do whatever he wishes. But he doesn't run a prestigious label (in fact, what's it called?), and it doesn't make releasing music on his label accessible to all. I mean, consider the cost of software, hardware, tutorials, samples etc., that's enough to get you in some proper debt, and then you have to pay this loon 10€ on top of that to maybe get your track released from which you will surely not profit at all!
If it's a prestigious label, then I maybe would've understood his decision, because an ASOT (label) release almost guarantees a play on the most popular trance radio show, which might result in some gigs, maybe. But GO hasn't got much to offer, and compared to more popular labels where the submission fee is 0€... You have to be a loon yourself to pay.