I was wonderin... Since CDPR is in cahoots with R.Talsorian, could GOG try to add a section where they sold PDF's of PnP RPG books?

Cyberpunk, GURPS, World of Darkness, DnD, Rune Quest, Paranoia, etc....

It’s probably not worth it for the effort. There are loads of places to get ebooks, humble does bundles, itch has a few, then there are the big players. They tried movies and that flopped bad. Better to focus on getting games.
Humble have a pathfinder bundle up at the moment if your interested:
https://www.humblebundle.com/books/pathfinder-second-edition-paizo-inc-books?hmb_source=humble_home&hmb_medium=product_tile&hmb_campaign=mosaic_section_2_layout_index_1_layout_type_threes_tile_index_3_c_pathfindersecondeditionpaizoinc_bookbundle

One question: why?

To be honest, I don't see any benefits by GOG selling these.
Neither for us customers, nor for GOG.

Sure, one could claim it would be another possibility for GOG to make some money...but to earn that money, they would have to open themselves to a whole new market segment.

And I'm sure we all are aware, how well that worked for them with the movie market?

Here, have a look: https://www.drivethrurpg.com/

I think, there is no P'n'P RPG that is not available there.

For acceptable prices (they also have sales on a more or less regular base) and DRM-free, as far as I am concerned (once downloaded, you can move the PDFs freely from one PC to another, and print them out as often as you want).

TL;DR: am I against GOG selling P'n'P RPG PDFs?
No.
I simply don't see the benefits from them doing so.

Bundles of Holding are always drm-free and can often be linked to a Drivethrurpg account. Plus, 10 % of profits go to charity.

I'd rather Gog give movies another go before going for ebooks.