The proximity of this and Bitnami pulling their 'free hardened images' is amusing, and I'm just as concerned about another (eventual, but imminent) rug-pull down the line. Docker Inc historically seems comfortable with the typical VC/"growth"-fueled strat of:

1. 'generous' initial offering to establish a userbase/ecosystem/network-effect

2. "oh teehee we're actually gonna have to start charging for that sorry we know that you've potentially built a lot of your infrastructure around this thing"

3. $$$