Yes, so although it is optimized to be very cheap to operate many users there still are costs. We hope to get that via donations or as it's communicated in the website "Pay what you want". One single advertising banner is also something we are considering. So the amount we have to get from active users is really low. Currently there are 80 integrations with multiple sites on the cheapest linode VPS. The redis database is 2 megabytes on disk and the CPU does not go over 1% usage (before this HN post). If you just take our current integrations and divide them by the costs the VPS makes you get to pennies per user per month. I did not put in my calculation that not all integrations are active but you get the idea :-)