You don't understand, or don't agree with the complaints. Those are two different things, and I suspect you
understand why people are complaining and instead
disagree with the complaints.
People are complaining because something was available, they adopted it, then it was discontinued. Apparently with little warning, and after they'd been encouraged to adopt it by the provider of the images.
As it happens, I agree with the general idea that if folks are not paying for the convenience of builds, then it's on them to work from source. However, it's better IMO if a vendor or project start from that position rather than what's seen as a rug-pull.
Of course, it's part of the playbook: when something is new and not widely adopted, the vendor goes to great effort to encourage adoption -- then the vendor starts looking at the paid vs. free usage and sees "huh, we have a 10000:1 ratio of paid to free users, including ten megacorps that show up grabbing binaries every 10 minutes for their CI/CD farm, and asking questions in our forums, but aren't paying a penny toward development and our investors are getting pissy."