Mentioned here Moving the Goalposts on Citizenship again - #48 by PTbound
I don’t know if this ruling affects Malta’s current (expedited naturalization) program?
My understanding is at the time the court case started (2020) Malta had a straight up cash for citizenship program, but since then this program was already ended and replaced by the expedited naturalization program, which requires 1-3 years residence in addition to investment for citizenship.