Is it just me or does anyone else just not buy it? Maybe it was done retrospective, or maybe he is just lying, I do not know how or why but I feel like this can't be done and he is just simply lying. It doesn't even matter if places ban you from gambling there as long as you can take your money out because at the end of the day if you can get your money out you can just go to another one, there are plenty of places that you can gamble and that is why it doesn't matter if a book bans you or not.
I just think that 5k into 1 million is not possible, not in 2000 bets, not in 3 years, not in 30 months, it is just not something that is possible. I get that if you do it now because you could go back and find the winning bets and act as if you bet on them but I feel like this guy is just a liar who can't because it is not about specific person, it is not about "this guy can't but that guy can" type of deal, nobody can do it.
It's possible! Anything is possible in gambling! You can win or lose millions in just seconds... in 3 years anything can happen!
I guess it would be interesting to hear more from OP, which sports he likes to bet on! He probably follows specific teams and from week to week (from one match to another) and he is chasing some specific bets (goals/points, correct scores... or literally anything).
You can take a look at some topic with sports tips here in the gambling section, some of the guys are here for a long time, and they have really impressive stats I must say! We can ask some of them about how possible is this, and do they know someone who did this already!