That's not entirely true, is it?
As I understand, you are only promoting the brands that have an A+ licence by Belgium Gambling Commission, which is only possible when you have a physical casino in Belgium, and there are
exactly 10 of those. You are choosing to ignore all other brands even if they're great, like Bitstarz. And that's a matter of choice.
There are lots of casinos that accept Belgian players.
I see 73 casinos here:
https://www.slotsup.com/online-casinos/belgium-be
This list has 63 casinos:
https://www.aboutslots.com/countries/belgium
This one has 170:
https://www.gamingzion.com/belgium/casino/casino-sites/
Certainly some of these can be worked with.
I'm
not telling you how to run your business. I'm just saying it's your own choice to reduce yourself to 10 brands since you keep repeating the "I'd literally have no one to work with" argument. Yes, if you require the online casino to be tied to a physical casino in Belgium, because only 9 physical casinos are allowed in Belgium at one time.
It's your choice to limit yourself to these.