This is interesting. 
Hive has added HomeKit compatibility to its hub. Smartthings doesn’t have HomeKit compatibility, but you can get some HomeKit integration by using homebridge.
All of which is to say if you are using both HomeKit and the hive hub, you might now be able to get some additional smartthings integration in that way.
For those not using HomeKit, there is an existing community-created cloud to cloud integration: