You don't buy DD games, son...you lease them under very strict terms.
Then maybe they should start listing them on PSN or whatever acronym they changed to and say in big bold text: "Rent this game for $9.95. BTW we can stop you playing it any time and you dont get a refund!"
If they represented what they sell accurately, no-one would buy them. The fact that they are obfuscating customer rights behind dubious EULAs instead of telling them straight up means that they are misrepresenting the product they sell in spirit (if not to the letter of the law).
But in the end, you "only bought the license". That's fine - but if they revoke that license for no reason that is the fault of the customer, then they owe them a full refund. If they dont refund them, then that makes Sony thieves.
All this will do is have a very obvious flow-on effect.
1. Customer buys DD game
2. Company revokes their access, does not refund customer and tells them to suck it.
3. Customer either a) pirates their games or b) buys elsewhere.
With any luck, publishers that resort to stealing games from their paying customers will either go bankrupt or learn quickly not to be arseholes.