They knew what they were doing. They released OSS to build traction and a community. In some cases, the community contributed quite a lot to the quality of the software - even if not a lot of code. It never would have gained any traction or interest from enterprise buyers without that. Then that valuable software they had already given away was used to build a business that couldn’t create enough value on top of it.

The only people with any justification for hurt feelings are the community contributors.