My experience is as follows:
For the past more than 5 years I WesterUnioned myself average $2500 CAD monthly. Definitely more than $20000 USD annually. Never ever a problem or documentation. No questions ever asked. None.
Suddenly in October 2023 and for some unknown mystery my WU account was blocked and went into a BLACK HOLE for about 5 months. I was told that one of the possible reasons is the WU annual limit. (which till today I still don't know).
During these 5 months I survived by doing the Colonia run It was non stop phoning WU, TD , BMO, SCO, VISA, MC ,,,, 24/7. (They all REFUSED to investigate or acknowledge the problem,,,,, they acted weird as if it is not their problem ,,,, they had nothing to do with it )
Finally, last month for some mysterious unknown reason suddenly my WU account is working fine. No problem. No documentation. No questions asked. None. Just like that!