A for-profit business also offering an open-source software is not a conflict of interest and perfectly fine, and like you show, there are plenty of examples of this behavior.

However, what absolutely is a conflict of interest, and is scummy as fuck, is running an non-profit that actively works as an advertising platform for your for-profit business as well as making it intentionally confusing to people that there are two separate entities of a non-profit and for-profit while giving preferential treatment towards that business among other competitors in the market.