"Google One" suffers from designer in a box syndrome.
It's probably a great internal name - hey, we've been providing storage for photos, email, docs, drive, and more, for over a decade, and we've finally integrated that storage into one space, so let's call it Google one! It's a great name - simple and powerful, symbolizes the effort and direction we've taken in the past 5-10 years of integrating our consumer, day to day products.
However, outside of the Google box, no one understands or cares what they've been doing. "Google one" sounds like... nothing. "What is it???" is an extremely appropriate response.
Maybe in the future it will come to symbolize all the services of Google, available in one centralized location, allowing for future consumers to easily access all of google services without separate pay schemes, storage, or
other infrastructure, and make it a 1 stop shop for your services needs, common or obscure.
But right now, the copy and landing page are way off the messaging mark.