Having worked in the industry, there's actually an explanation that is only half predatory.
Most of those addicted to gambling can't and won't shake it. They refuse to seek professional help, and the decision to quit only lasts the "temporary embarrassment" phase of losing all their money. Meaning: most gamblers who decide to quit (and we've got statistics on this), about 80-85% on average, is back to their favourite gambling service within 60 days.
At the company I worked at, the primary reasoning for having a cooldown period instead of instant deletion was the following:
- the cooldown period can already be linked with our lockout service which blocks the person from using the service for X days, so if they REALLY wanted to, they could block themselves for the entire time (and it surprisingly is being offered as part of the cooldown period)
- if there's a regulatory block (meaning you got formally diagnosed by a doctor, and that doctor, with your consent, reached out to the local regulatory body and requested a blacklist entry for you), the service is blocked either way
- the users who do come back, don't want to lose their "stats" - their previous bets, wins, losses, etc. would all be gone with a new account. In fact, the number one complaint from returning users was that their data was gone.
Basically the idea is "if they're coming back anyway, we might as well make it easy for them".
Now the thing is, for all the regulations... Gambling services are unfortunately not responsible for the addiction they cause. In my opinion they should be, just as a doctor would be held responsible if they fed into a patient's painkiller addiction. And for all the regulatory crap... most people in gambling companies aren't interested in compliance that much. It's very much a "do it then say sorry and fix it in post" attitude from the leadership and higher management. So while the above might be the "official" explanation, I have zero doubt that the decision makers don't give a fuck and are specifically doing it to psychologically pressure people into coming back.