Of course they would prefer to not have to not have to meet the requirements of the Bank Secrecy Act or FinCen and just service gamblers (as it should be now states have laws).
But there must be some reason they do it. Maybe they care more about 700K fines than you imagine...
https://www.fincen.gov/sites/default...508_101920.pdf
https://www.fincen.gov/sites/default...2004.18.19.pdf
https://www.fincen.gov/sites/default...k%20FINAL2.pdf
https://www.fincen.gov/news/news-rel...gainst-virtual
https://www.fincen.gov/news/news-rel...aundering-laws