I've been obsessed with those kinds of strategies for (A)GPL software lately. If it's true, like the critics say, that customers like locked-down, dumbed-down software, there's no reason we can't do that with GPL stuff - even though it can be easily bypassed in then source, and other distributors can sell clean versions, plenty won't.

GPL software should use the same predatory tactics as proprietary, and trend chase. Focus primarily on trend-chasing and marketing, focus on getting cash by any means necessary other than not making the source available. Market hard, dual license.

Dropping a license check in (as long as it's not obfuscated or intentionally confusing) is very cool in my opinion, and I wish you luck. Thanks for adding to the commons.