It looks like mysql source code is on github https://github.com/mysql/mysql-server and that we can actually follow development.

I meant to type ‘seriously’.

“And anyone running Linux Seriously must know that the ‘M‘ of LAMP stack has changed.”
It should be ‘seirously’ and not ‘Seriously’ in this sentence for example. You only capitalize pronouns in the middle of a sentence.

The big advantage of a database system is that information is stored in a logical way that makes it efficient to query and update. Database management systems contain the software used to create, access, and manage databases. Vendors have gained reknown (and marketshare) for their databases by making them fast, reliable, and highly scalable. Many advanced features have been added to make it possible to express sophisticated relationships within relational models. The extent to which these features are supported, and the extent to which performance can be tuned to optimize for certain characteristics are attractive features.

Oracle, Informix, Sybase, Microsoft, and several other companies dominated this market for many years, and are known for being extremely expensive. What set apart both PostgreSQL and MySQL was that they are free and open source. MySQL was aimed at simplicity that still supports effective scalability. PostgreSQL was aimed at supporting a more advanced set of features at the expense of simplicity. Given the uncertain future of MySQL (or of any open source software bought out by a commercial competitor) the availability of of the MariaDB alternative is very welcome to all in the industry.

Another reason is that mysql development happens behind closed doors with the occasional release. While it is a very well maintained, there is no way to follow day to day mysql development.

You can do that with mariadb https://mariadb.com/kb/en/mariadb/documentation/getting-started/compiling-mariadb-from-source/source-getting-the-mariadb-source-code/