Free typically means user data is a profit mechanism. I dont see info on geo/national aspects of your service like who and where you are, or even a ‘we had XYZ trusted-org audit us’ . And who’s paying for storage? You mention searchable mailboxes, 25 meg attachments, but no limits… starts to feel like someone could abuse this — then when the cost becomes insurmountable, we all lose info if you discontinue.

One can both trust and want shared/gift economies and fear for instance that seem ripe for abuse.