I would've thought "most" people would be firmly on the free tier, are there any stats to check how common it is? Personally I've had Gmail for 20 years, Android phones for 13 years, Home/chromecast devices but never thought about paying for Google One or any other services.

Do you have a pixel and/or use photos? That's how your quota really fills up

If you're storing photos in Google Photos, the free quota gets used up quickly