I appreciate the response! My first thought and assumption was indeed there are backend costs given the size limitations you mentioned. But I suppose if that is sufficient for some folks, then they can benefit from that without requiring a subscription.
I can understand your point a bit more about wondering about one-time fee versus subscription as you were operating under the assumptions of recurring server costs.
I was aware they were using Chrome.Sync and that it did not impose a cost so that changed things in my head.
