My feeling is that Rigol is encouraging it, becausei nformation on how to do it is all over the Internet. It has been so for years. Rigol could have easily modified their software, at least to make it more difficult.
Why not encourage it? Just think of the overwhelming number of sales they are generating. They are making much more selling a large volume of units vs. trying to get people to pay the $100 or $200 for the extras.
I would be really curious about how many units they sell an average year.
About dealers,(or sellers) doing the hack themselves. Except for the major distributors, it is a good way to get you to come back for future purchases. Once you get the rhythm, just get some person at minimum wage cracking away. If in China, labor is much less