The start of another walled garden...
It'll be gratis, right until you have started relying upon their service, and that's when they'll start charging the users.
Another.com were using this business model in 1998.
Free ad-supported email/webmail, but after you had been using the service for 30-36 months, they would start charging you.
During one London Meet-up, i was talking with one of the tech's from Another.com, who told me that this was entirely deliberate.
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