A few pro audio companies like RME have chipped in documentation to help with Linux drivers, but most are reverse engineered, or created from documentation of the ASIC the interface uses, like the ICE and ENVY chips. However, the generic ASIC drivers do not take into account any special sauce the vendor added to the interface so they almost always cannot take full advantage of the hardware, or may not fully work without special quirks being added.
Then there's the class compliant audio interface drivers. These are mostly confined to USB1 class compliant devices, which once again will only take advantage of features that are part of the USB1 audio standard. USB2 class compliance for Linux is still in bad shape, and USB3 audio interfaces are virtually non-existant.
If two applications have close to the same feature set and quality but one is open source while the other is proprietary, then obviously I prefer the open source application. Unfortunately, nothing really comes close to Reaper in the open source world so I would have no issue paying the very nominal fee that the Reaper developers ask for.
Belive me, I'm not happy with that situation either, but it's not my choice to do anything about it.
Programmers should work for free. If they want money they should get a REAL job!
Yeah they must earn some money for their job, but for a real job, not remaking something that already exists with small differences. They must sell samples and presets for open LMMS (not FLStudio), scripts for GIMP that are not exactly programs (not Photoshop), cards for LibreOffice (not Microsoft Office). And at the end LMMS has 2-3 good metal guitars to play, FLStudio is a garbage that doesn't do what they say it does. Actually closed source its complete garbage anyway. The only reason they exist is because we haven't take them seriously, for example: If the samples of freesound.org were mechanical sound forms (samples and presets) like Kontakt, with the analogous program and plugin for LMMS and others, then i don't thing that closed source will ever make a single sale.
Regarding their economic policies they are apparently a mixture of public and private.