Definitely a good idea! The only thing that would make me hesitant to use this service is that you are at the mercy of any kind of network outages between your

Definitely a good idea! The only thing that would make me hesitant to use this service is that you are at the mercy of any kind of network outages between your servers and mine. If I have a DNS outage, a main network node down on the route when the request is made, etc then my cron will not get executed. A super great feature would be the ability to specify a retry flag for individual jobs. So if you attempt to call a cron endpoint on my server unsuccessfully, your service would keep trying every couple minutes until successful (or the next scheduled execution occurs). Otherwise, good work and good luck - surely solves a pain point many cloud devs have!