Because Salesforce decides it’s not profitable enough to be worth it, or they want to close Heroku off to Salesforce customers, or any number of other reasons
I work there. We are still around. Maybe not making waves as much as we used to but still hacking on stuff.
Right now I’m in the progress of rolling out a new platform powered by Cloud Native Buildpacks that allow you to build an OCI image locally. Here’s some language specific getting started (local) tutorials https://github.com/heroku/buildpacks#heroku-cloud-native-bui...
Nice to hear about the buildpacks. I use Containerfiles but since switching to Podman and Fedora/RockyLinux I've seen stuff about OpenShift which supports buildpacks. https://github.com/sclorg/s2i-base-container/