This is good, just like pruning old images. What's bad, and what Docker isn't saying, is it was a mistake to ever allow unlimited free plans. Independent of scale. Setting up an expectation of unlimited free hosting and bandwidth at any point of a business is bad. Tuning knobs of paid hosting and services at all tier levels, with a limited free tier, should have been baked in from the beginning, and would have led to a much stronger business.
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.
