You can't answer with certainty, because the authorities aren't doing their job. No credible, informed person would conclude that there wasn't that kind of activity hapening.
Trump is fairly stupid and reckless, but the 2nd administration is blatant in it's corruption and illegality. The assumption is in the waning days of the administration, they will pardon those who remained loyal.
The argument you use re: gambling is incredulous and a false assumption. The existence of black market gambling isn't a justification to what is happening now -- the full power the marketing and advertising machine. Personally, I'm okay with gambling personally as a fun thing - I don't get a big rise out of it. But I think that making every iPhone a betting terminal is creating social problems that will cause alot of needless misery.
We reject the moral turpitude argument to justify gambling, but hold the abusive gambler personally and morally accountable for their misfortune.
Well you can answer with certainty that Americans making electronic transactions on an American betting site is not money laundering, by any definition. For more certainty than the original assertion that it is a money laundering play which just doesn't make any sense.