Oracle’s ownership of MySQL AB seems to have negative impact on its development. My concern, which is also raised in the article, is whether similar things will happen to Postgresql.
1) Neither company owns any part of the PostgreSQL code / docs. We do have various proprietary tools, of course, but so do other companies.
2) The companies employ quite a few PostgreSQL hackers, but if you look at the development stats (e.g. http://rhaas.blogspot.com/2020/05/who-contributed-to-postgre...) you'll see there are many committers and developers in other companies.
That being said, I agree with the concerns expressed by Bruce in his blog post. Or more precisely - I do understand why people in the community have those concerns, but I believe (hope) it's not going to harm the community.
Percona created their own mysql distribution [2] with a number of improvements, which was quite helpful while awaiting (very long) release cycles from Oracle, for MySQL community.
1 - https://www.percona.com/software/postgresql-distribution