I'm not quite sure how allowing filtered OAR exports will affect profits, since you're giving people the ability to make backups of their own work.
Maybe some grid managers fear that the only reason people stay on their grids is because they can't get their content out.
If I had a strong, popular grid with an active, engaged user base, I'd want to offer OAR backups as a way to attract builders and make existing customers happy.
Trying to keep customers by force is a bad strategy in the long term.