Encryption is not widely used because people are more afraid of losing/forgetting their encryption_secret_keys/passwords than others accessing their data. Plus almost all users trust large cloud companies like Google, Amazon, MSFT.
Catering to the small minority that are worried about encryption with a usable key management product (which is what is lacking today) is not financially viable since they expect a open source solution.
I expect the situation to get qualitatively better when software obfuscation hits mainstream.