They definitely tried that with MSSQL. Didn't worked so far. But M$ tactic is always the same. Copy, throw money, copy some more, throw more money. If doesn't work, change the CEO, throw more money until the rival is dead. So yeah, they are throwing money to try to suppress PGSQL from existence. They did that tactic with Delphi (bought the main guy from Borland and that's how we got C#), MSSQL is their answer to PostgreSQL, ASP is their answer to PHP and so on. Oh, and if you think "MS loves Linux" is anything but this tactic, think again - WSL/WSL2 is the proof they still trying to kill Linux.