Late betting bans aren't uncommon in sports books.
That's right. Players can get banned or limited for it. And that's ok as long as the player actually did that. But you never provided one single example of a late bet from this person. Still, you took his money and made him look guilty and decided to play with words about who said what. The one example you posted, you failed miserably because according to the data that Poika5 found on a 3rd-party site, it was a legit bet placed 8-9 mins before the end of the match.
Who knows how many other players were and maybe still are treated in the same way, but they simply give up and don't scream as loud as Laki did. Maybe the $2k he withdrew is money confiscated from other innocent players in the period since this thread was started.
Get your shit together. You will have much more success long-term running a legit operation than being scammy.