Ask HN: Why does Google have a much lower FIPS Encryption Level compared to IBM?

FIPS 140-2 is a standard which handles cryptographic modules and the ones that organizations use to encrypt data-at-rest and data-in-motion. FIPS 140-2 has 4 levels of security, with level 1 being the least secure, and level 4 being the most secure.

Google Cloud has level 1, and IBM Cloud level 4.

Why did Google not pursue level 4, and does it matter? If it does matter, under which circumstances would a company choose to select IBM Cloud due to this higher level?