2005. There was still code and pages dating back to then running and being used. But over the years, more and more was built on top of it rather than a different stack.

Frontend code would vary with whatever flavor a developer liked at the time, but the backend was still always going through Rivet/TCL.

ICs would complain about it but the founders cashed out to the tune of 9 figures in the end, so it worked out for them.

I’ll agree that TCL isn’t inherently insecure, but you aren’t getting any libraries or frameworks with it either to make your life easier or safer.