Are the TUI apps built on TUI frameworks? Do the TUI frameworks last longer than the gui frameworks you mentioned being quickly killed by "big corps"? In the Windows space, WinForms, WPF, WinUI are likely the biggest examples of gui frameworks, especially from "big corps"; they've been around for decade(s) and have not been abandoned (/ they continue to be supported) - how do TUI frameworks compare? On the other hand, TUIs may be better for things like running over SSH, and for cross-platform compatibility - important, yes. Although for x-platform, things like Avalonia or Uno could be better comparisons?
Curses, the TUI library, has been around since 1978. It was superseded by ncurses in 1993, which saw it's latest update in December of 2025. Both of them still work and can be used today, with the caveat that the official original curses has been deprecated since 95, but NetBSD maintains an updated version iirc.