Free PDFs are by no means an industry standard and four of the top five all five of the top RPGs in the fall of 2019 require PDFs as a second purchase (edit: unsure of the fifth. Thought it was free PDFs, but that was only for pre-orders), and two have no PDFs at all. (One has no electronic book access.)
For reference, looking through the ICv2 Charts, the top games reported over the last couple years are:
D&D: No PDFs. Digital copies sold on an app/website for $20, or $30 for compendium and a character builder
Pathfinder: $15 PDFs sold separately on their proprietary website (unless you're a subscriber prior to shipping; aka pre-order)
Shadowrun: $20 PDFs sold separately on DriveThru
Star Wars RPG: No digital products.
Starfinder: $10 PDFs sold separately on their proprietary website (unless you're a subscriber prior to shipping; aka pre-order
Vampire: PDF included free if you purchase from their webstore or a $25 PDFs sold separately on DriveThru.
Alien RPG: $13* PDF sold separately on DriveThru
-edit: also free if you buy from their web store-
*currently discounted from $25, not sure if a sale or not.
Legend of the Five Rings : $25 PDFs sold separately on DriveThru.
Genesys: $20 PDFs sold separately on DriveThru.
Of that list, only ONLY
Vampire the Masquerade and
Alien have free PDFs with purchase. And that requires you to buy the book from the publisher. If you buy from Amazon or support your local game store, you need to buy the PDF separately.