There is no specific policy forbidding arbitrage. But as you seem to realize, if there is ANY sort of complaint or question about your products, you will not have the proper documentation to resolve the issues.

There are still people who do RA/OA, but it's becoming more and more difficult. Unless you really know what you are doing, and sometimes even if you do, the likely eventual outcome is having your account deactivated. Even the biggest RA proponents seem to have disappeared over the last few years.