US Tech companies do nothing without long term goals, watch PostgreSQL being acquired by Google.
Remember, these things happen within closed door, we will never know until it is already too late. Google closed Android source close, expecting nothing good from this "investiment"
MySQL for all its warts seems easier to run operationally and has a better scaling story(Vitess) than PostgreSQL. even though I use PostgreSQL.
Assuming what you are seeing is true, I doubt it, MySQL is owned by Oracle so unless Chinese companies living in a cave, I doubt it again, and missed what Oracle has done recently, if you have a business and it is investing into MySQL, your business is set for failure in the near future!