IAANAL, but always free sounds like it could fall under puffery: https://uslawexplained.com/puffery

'Always free' does not sound like an opinion.

Especially since, by the "reasonable person standard," they have been offering it for free, so a reasonable person would conclude that they will continue to do so as promised.

It’s a “always a free option” which doesn’t clarify what you get with the free version.

IIRC LastPass did this by slowly reducing how many devices and what kinds you could sync. They made the free option increasingly painful.