Aha, I wonder why they chose to advertise it in such an obstructive way. It seems like they're not even saying what it is, let alone why one might want to use it.

Given the URL included one.google.com , I assume it's for individuals only?

Reminds me of this which I wrote 5-6 years ago... seemingly still true https://medium.com/@buro9/one-account-all-of-google-4d292906... , though since then I've almost completely de-Googled (due to Google being Google).