I would assume it's companies that are running computer kiosks, point-of-sale systems, or systems that would otherwise be extremely locked-down (like bank teller systems).
As an example, we're currently evaluating it as an option for doctors to access certain EMRs offsite where it doesn't make sense to provide them an entire workstation, e.g., community doctors working from their private practices.
Restricts Freedom to Use the Software
I've always found this particular one somewhat frustrating. It's essentially the intolerance paradox repackaged into a software licensing analog:
"You are restricting the freedom of users by taking away their ability to close the code and restrict the freedom of other users!"
It's always read very "I got mine" to me.
That said, while I lean copyleft, I also don't find just barring commercial use entirely interesting. The goal is to ensure source code remains available to users; I think there are better ways of addressing that than trying to delineate and exclude commercial use.
PLA will mostly get brittle over time as it absorbs water. Biggest issue is that if it becomes more likely to break while feeding. Drying will help some there. On the whole, it's fairly low in hygroscopicity compared to a lot of other materials.
Drying is part of the process when raw plastic pellets are used in injection molding. The only reason it's not more common in 3DP is that common materials like PLA and ABS arent particularly hygroscopic. PETG is slightly more hygroscopic, but materials like TPU, PET, nylons, etc are highly hygroscopic and definitely need drying to print well.
Also remember that PETG needs more room between the nozzle and the build plate (higher z offset) so that the filament doesn't stick to the nozzle and make a mess
This is one of those pieces of 3DP lore that isn't correct. If Z offset is set accurately, it doesn't need to be changed for any material, but extrusion multiplier/flow does.
The reason why bumping z offset bandaids the problem is because PETs are highly incompressible, i.e., they don't respond well to being squeezed and will displace under pressure. Raising the z offset means you're putting the same amount of material into a larger physical volume. This effectively lowers EM for the first layer, but introduces accuracy issues in the rest of the print.
Instead, it's better to make sure z offset is dead on accurate and then adjust EM down so that flow is correct throughout the print.
Swap caps lock and left control. It's the first thing I do on most of my computers, especially notebooks.
The newer versions of Windows Powertoys from Microsoft makes it easy on Windows.
Been easy on Mac and most Linux distros for years.