You're not wrong. They add miniscule value. But what does that say about the people using these images who are now struggling to replace them?
If their value-add was miniscule then they should be trivial to replace.
If it's a struggle to replace them then that's the value they were adding.
A select few will pay for the rest of us, but it's valuable to everyone who uses it.
Broadcom just wants to squeeze anyone who can't do it themselves.
That said, it seems to be a side effect of their business model that they don't feel they can offer for free, or otherwise choose not to in order to convince people to move. It seems there's nothing stopping someone from forking and/or continuing the packaging for apps they use based on where Bitnami is today. Cool.
I'd personally like to see a lot of these hardening efforts upstream anyway... separating base images for build vs. runtime and more so with the "official" app images themselves. People do and should have different expectations from a lot of applications when packaged in a container vs. installed on a system.