It's more a case of "wont do" rather than "can't do" with regards to US players.
Many casinos pulled out because they are listed companies, others because they found dealing with payments too problematic. Many later pulled out once casino and eWallet execs started getting arrested in the US when passing through.
RTG have decided to allow operators to make their own minds up. Many casinos still serving the US market do so becasue there is no real sanction the US can bring to bear. This would mean the operators having no assets in the US, and no execs intending to travel to, or pass through, the US.
RTG recently made a sweet corporate manouever to enable them to continue to serve the US. The US based RTG passed all rights to the casino software to Hastings, and it is Hastings that now provide "illegal" casino software to the casinos still serving the US. Hastings is based outside the reach of the US authorities, and what has happened to the original RTG HQ is a bit of a mystery. They claim to no longer be involved with gambling, so are thus supposedly safe from any action.
Other software is available to the US market, including a few Microgaming casinos.
US players should be aware that there will be an increase in rogue operators looking for a quick killing from a large market ill served by much of the legitimate side of the industry.
Playtech and Cryptologic have withdrawn due to the software companies "advising" its operators to pull out voluntarily. This is "voluntarily" army style
