I don’t know why you got the impression I disagreed with that sentiment. I’m saying that Steamlink shows a deliberate effort on the part of FAF to do as you said, officially mandate that all copies of Forged Alliance associated with FAF accounts are legal. You can circumvent this, but this no longer FAF’s responsibility. Just like you can pirate Roms for your SNES emulator instead of ripping them from a cartridge as recommended (with no enforcement or verification system). The emulator creators have zero legal responsibility in that case, even though I would argue that in their case they know 99% of their users are gonna pirate.
It goes without saying that Square Enix could go after FAF regardless, but this makes it less likely. The fact that FAF has made a good faith attempt to combat piracy does matter.