I believe Rigol, Siglent and others like them know about these "hacks" and in fact are subtly encouraging it
Advertising is expensive and by allowing a "hack" to a higher level of performance/features, but making it not too easy, they have cleverly created a opportunity for technical savvy folks, like the one's here, to openly discuss this capability and convey the means to so. This improves the awareness of technical folks that may not have heard of them, that may be employed in electronics, and may recommend them to the firms they are employed with.
Very clever business model IMO
In my case I've retired from the Chief Scientist/Engineer position, Adjunct Prof, Consultant, IC design, over 30 patents issued and a career that was over 50 years (been around advanced R&D electronics a long time). I had never heard of Siglent nor Rigol, have always made decisions to purchase TE that was HP, Agilent, Keysight, Tektronix and a few R&S instruments. So when I retired and wanted to still tinker around I got a couple Tek 2465 scopes and a couple 34401A DMMs off eBay, and fixed them up. Later I needed to cal the 34401As and decided to get a Keysight 34465A DMM since this would be a known reference source, then realized I needed a DSO and began following all the posts here. After some time and reading thousands of posts I decided on a DSO, which was hacked and enabled by the help of folks here. This lead to the purchase of an AWG, then a Spectrum Analyzer, all "hacked" with the help of folks here
Do I feel guilty, hell no
I paid for everything out of pocket, so no biased reviews, Siglent paid me nothing, and this detailed experience has made such an impression that I would highly recommend them to anyone without hesitation
If Siglent had hired me as a consultant, they would have paid way more than the cost of this equipment.
Just count the number of threads and posts (also other sites) that are related to "hacking" this equipment, then ask yourself what this level of exposure would have cost utilizing conventional advertising, then estimate the "lost revenue" that would have been created by not allowing "hacking". Now consider the direct recommendation benefits to higher level companies, which they likely could not penetrate because of lack of exposure, like myself that just purchased Keysight, Tektronix or R&S gear. Sure they aren't going to bump these tried and true sources for the higher end gear, but likely may get their "foot in the door" at a lower level general purpose usage platform with the help of some employee that has some home gear that was "hacked"
This is a clever business model, that is obviously working well for them
Best,