there is plenty open source software, that you can buy. There are many modes:
- you buy the support (redhead)
- you buy the long-term-support (ubuntu)
- you pay for backports to old releases (keycloak iirc)
- there is a open source version, and you can pay for enterprise features and hosting (gitlab)
- there is an open source version, and you pay for customization (star office, iirc)
and my personal favorit:
- you pay a random developer to submit pullrequests for bugs that are relevant to you
is this true?