There are still some weaknesses in the gambling sites, but what can be done about them? There is a lot of talk about cheating and arbitrage betting. Perhaps rightly so, but what can be done about it? That hassle with table tennis and cams, that does not make sites happy. And then with corona you also had a lot of competitions that were manipulated by the bookies. There are too many matches to monitor all of that in time.
These are rather inane questions. One of two things is going to happen to sites that have a vulnerability like the examples given. Either they will have measures in place to limit the damage and eventually be able to identify the bug, as we saw with the hacker who was kind enough to disclose a glitch. The other possibility is that the staff fail to identify that they have a losing edge against a player, if the automate withdrawals then it's very possible they'll be wiped out before there is any chance to figure it out. These are very profitable businesses when done correctly, so when you see dead sites then you know they probably lost a fair chunk of money and gave up.