$100 ZigBee Blinds - Astomi - Do these work?

No, the Tuya SmartLife app has a Cloud integration with SmartThings Cloud (for a limited number of devices). Unfortunately, a lot of Tuya devices do not conform to Zigbee standards. ST direct connection is ensured by SmartThings community Edge drivers.

@user2574 confirms in this post that they work with the community-supported Zemsimsart blinds driver.