What I feel would be acceptable:
If you're proud of your Framework laptop and want to brag about it, we'll give you some swag for free that you can show off with when you're out and about!
What this looked like to me:
If you're attending a conference we'd be paid to attend, but can't go to, will you show off your Framework laptop to attendees in an effort to convince them to buy one from us too, and we'll send you some stickers?
The issue isn't even what they're asking for, but how their asking it.
All the CDLC for RS2014 work by pretending to be the DLC for "Smashing Pumpkins - Cherub Rock", because it was given away for free as a preorder. If you get any of the other delisted DLC, you can use Rocksmith Custom Song Toolkit to change the ID to one you own (free or paid, as long as you have a steam license for it) and it should work.