For example, when someone wins a big multiplier and multiplies their account by 100x, then some casinos take a long time to process the withdrawal, or they may not even give the money. however, some say that if you sign up using a good affiliate or influencer affiliate code which have huge audience, then you won't face these type issues. also, if you promote the casino using your referral link, they might not hold back your withdrawal because you helped them get new customers.
This isn't true, any casino that cares about its reputation will not be involved in such shady practice, and if there is an actual warning triggered by the security system the bets or withdrawals will be put on hold until further verification irrespective of the individual. Referrals is more benefit for the one who share the code with you because they will get some fraction of your lost bet to that casino forever.