I don’t think it was a mistake per se, it was part of their growth strategy. Their biggest problem is that they never really managed to capitalize on the market

I don’t think it was a mistake per se, it was part of their growth strategy. Their biggest problem is that they never really managed to capitalize on the market (and kubernetes happened), so now their plan B is to effectively reduce costs of docker hub or get some money out of the people using it. Completely understandable imho.