There's nothing wrong at all with charging for your product. What I do take issue with, however, is convincing everyone that your product is FOSS, waiting until people undertake a lot of work to integrate your product into their infrastructure, and then doing a bait-and-switch.
Just be honest since the start that your product will eventually abandon its FOSS licence. Then people can make an informed decision. Or, if you haven't done that, do the right thing and continue to stand by what you originally promised.
Just be honest since the start that your product will eventually abandon its FOSS licence. Then people can make an informed decision. Or, if you haven't done that, do the right thing and continue to stand by what you originally promised.