I am not a fan of the lottery approach and being told you're lucky to do business with them.
First you have a limit of 1 stardust per datacenter per customer. Second, they only spin up a fixed number of new stardust servers per day.
It is a loss leader just like in any other business. They are losing money on one instance to get you in the door and you realize their other services are awesome.
For anything that is supposed to be visible on the internet, I'd always use a hosted server - if nothing else, because I really don't want to open an ingress into my personal home network, even if my ISP permitted that.
For use-cases were you have to handle certain incoming requests even though your setup is mostly LAN-only otherwise (webhooks, ACME, adding some dashboard you can access from your phone...), services like PageKite[1] sound promising.
I stumbled over the service by trying to understand how the WebThings gateway was supposed to work.
https://iot.mozilla.org/docs/gateway-getting-started-guide.h...
https://github.com/WebThingsIO/registration_server/blob/mast...
Not unlimited data though. But I'll keep them on my list, thanks