Did you see this?
Comcast bought Stringify in 2017. Stringify employees are now Comcast employees. Some of Stringify's technologies have been incorporated into Comcast offerings (IoT or otherwise), and continuing to maintain Stringify or develop it further are no longer priorities at Comcast.
I would recommend using home automation packages that are fully locally controlled, and have powerful automation engines. Several of us switched from Wink to using Hubitat. It has z-wave/zigbee radios, so all those Wink devices transfer over very easily. It can control Lutron ClearConnect devices locally if you have a compatible Lutron bridge. And a very powerful, locally-controlled, automation engine. All my Stringify flows transferred over into Hubitat automations and more - I now have things like Alexa announcements based on automation events - a feature not supported by either Wink or Stringify.
There are several write-ups on moving from Wink to Stringify. Here's one from Reddit.