One of the DISBoards Moderators called and got a supervisor on record (via an acknowledged recorded line) to state what DVC considers commercial:
Did Yes but I had to ask to be escalated to a supervisor... Join the DVC Mousecellaneous discussion on DISboards.
www.disboards.com
There are lots of clarifying posts later in that thread, but that's the important one. In short: you can rent to recover up to (but not more than) your total annual maintenance fees. So, if I own 300 points, with total annual fees of $10/pt, or $3000, then I can rent 150 of those out at $20pp, or 100 at $30, but cannot exceed $3,000 in revenue.
If Disney follows through on this even a little bit, it will completely upend the rental ecosystem.