Hi, Tabnine's DevRel here.
The past 12 months have been quite a journey, and a lot has changed. To make a long story short: We've trained 12 standalone models that are now used to serve highly accurate code completions based on current project & file context. I encourage you to give it another go.
Tabnine CEO Dror Weiss, wrote this detailed thread explaining some of the key differences (both in technology and user-approach) between Tabnine and Copilot: https://twitter.com/drorwe/status/1539293063117516801