Comment by unsnap_biceps
22 days ago
Your costs will change and shift over time. Personally, I don't trust anything that says "Free Forever" or "Unlimited". Give a real limit and figure out the transition. "Free now, and no plans to change, but if it does, we will give you one year to transition" is much more confidence building then "Free forever".
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Google was already fairly profitable when Gmail was started, and did a considerable amount of capacity planning.
It was also invite-only for a loooong time.