Thanks for noting the tech stack, was the first think I was curious about. As for "freemium": as others pointed out, I'd also put it that as long as you can se

Thanks for noting the tech stack, was the first think I was curious about. As for "freemium": as others pointed out, I'd also put it that as long as you can self-host full-fledged instance it's "free". Having possibility to use their "cloud" instance without charge with sole limitation of maximum 15 users is "more than free" from my point of view: they are basically paying your costs for running that. Sure, it might be negligible for them in scale, but still, as long as it saves you time and hosting costs (install and maintenance), it is a value *you* receive for free.