I've been sports betting for about 10 years and am used to sending proof of identification / address etc. Over the last few years proof of wealth/funds have also become the norm and I've sent it to several sites without problems.

After depositing to Betrebels using my personal online banking (Trustly) and attempting a withdrawal to the same personal banking account, I get asked the SoW/SoF stuff (this was after verifying my address and identity). Alright, standard - I send them the proof of income and fill in the SoW form. Now they are asking for full bank statements of the past four months. This has never happened before and to me seems like an excessive request of information, but IANAL. Now, I probably should just ignore my rights and send it and then they might ask for a selfie holding up my ID or whatever these cash strapped sites usually do and eventually I'd probably get my money, assuming the site isn't completely busto. But I don't have much money there and am tempted to for once not complying with every ridiculous request these sites are accustomed to having and am thinking about filing a complaint under the license holder MGA and seeing if I have a case. Note, I did reply to Betrebels that I'll gladly send them anything specific they ask for regarding my SoF/SoW but the full bank statement over such a long period is an invasion of privacy.

Am I being unreasonable? Is a full bank statement of the past four months really something they could request by law and not excessive (especially since I deposited / tried to withdraw to the same, personal banking account and not something sketchier like Skrill)? Maybe this is a stupid hill to die on, but I'd like your opinions before I contact MGA... mainly just to prevent MGA from messaging me "just send them all your personal info of the past 10 years you righteous ****, they can request whatever they want".

I work in the industry in Vegas, so obviously don't how it works in Malta, but my guess is you got flagged for something related to AML compliance. Can you think of anything that might have spooked them? I've only ever worked in the trading side of the business so don't have any insight about this SoW process they are putting you through. I can see how their request appears abusive from your perspective, and I can also see how the request might be legit from their perspective depending on how strict the compliance regulation is over there. Whatever you decide, keep us updated, am curious how it plays out.

Shadier sites use it as a KYC harassment tool on sharps and as a way of making gnoming as inconvenient as possible for everyone involved

Basically unless you're willing to go through the hassle of contacting their regulator it's easier to comply if there's nothing on the statement that will flag them to not pay you, but generally speaking they are likely to be going on a fishing expedition to look for an excuse not to pay you most likely unless your account is down a huge sum and it's a legitimate AML request, but in my experience that is rare, out of all books I have only every had 365 ask for it on an account that is down decent money the rest of the time it's been on obviously sharp accounts with trivial deposit sums that have won a bunch of money as a harassment tactic