You're not forced to use dockerhub or kubernetes, in fact I use neither. Also if a team chooses to host their images on dockerhub that's their choice, it's like saying git is bad because Microsoft owns GitHub, or that installing software X from the repos is better than compiling because you need to use GitHub to get the code.
Also docker images can also be easily mirrored, archived offline etc, and they will keep working after the packages you archived stop because the base version of some library got updated.