Have you write the customer support on their site about the situation and have you send PM to Stunna before now?
There is no solution which is 100% perfect to stop the spammers misusing the gambling chat.
There are certain solutions that can actually restrict spanners to a huge extent, but that would require setting intense restrictions which could possibly drive away legit gamblers thanks to the strict rules which is why casinos think twice before implementing these rules.
The easiest one to implement is that temporary ban the user on chat who asking for money or spamming links after X no of times.
I have seen such rules in the trading exchanges platforms and it works perfectly to stop the spams.
It has been implemented since long time ago by Stake, seems that you are not an active player here. Stake has many chat moderators as well as a BotMod to minimize the spam. I believe there many accounts are banned (temporary) since the first day of Stake till this time. We cant deny the fact that spam does exist on almost all gambling site's chat, especially gambling site that has so many users like Stake.
No amount of restrictions, mods check and bot mods can stop spammers from operating on every gambling site chats because they will certainly find a way to target their prey and it can only minimize spammer but the totally protection is in the end of every individual. However, i still wonder why someone will trust a strange in the first place.
You can lower it, but if one person wants to spam, he could cheat the system as maximum as he can by risking a ton of money when he wants to. Just to give an example, it is 500 bucks to chat right? Well one person could have one 500 dollars, same 500 dollars, and try to play as close to 99% chance to win as possible, I think 98% or so?
Anyway, he does have a chance to lose, which is risky, you could lose on the first try as well, so it is risky. However by logic you can get 100 accounts give or take on average with the same 500 bucks if you are lucky, and after that if you lose, you lose 500 bucks but you have 100 accounts. Just keep on spamming and keep on begging and keep on trying for rain and so forth basically try your best and you could get something out of it those accounts as well.
I'm totally lost and dont get your point verywell but how can a single individual have 100 accounts on a gambling without been notice? Mind you, this is totally a risky and the worse/bad advice ever.