I'm mixed... I've spent the time to create installers and docker images for a couple things, mostly because I wanted them to exist for myself, that others found them useful was a cool side effect. Nothing to the breadth or scope of Bitnami though.
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.