When you publish open source, this is what you sign up for. As a publisher of open source software, I think "open core" does a huge disservice to the community as it feels deceptive. While there is no denying that creators needs to be paid, communities thrive on freedom and openness, and dual licensing takes that away.

Companies that publish open source must realize that they cannot make money from the "software". Open source gives companies a brand, that they can then leverage to do other services like support, consulting, hosting, merchandise, events, etc.

There was a time when service companies wanted to move into products because of high margins and artificial scarcity, but enough open source will ensure that software licensing is not a sustainable model to seek rent, and product companies must also move to services to be able to grow and sustain.