SCTP is exactly how you establish a data communication link with the very modern WebRTC protocol stack (and is rebranded to "WebRTC Data Channels"). Granted, it is SCTP-over-UDP. But still.

So yes, SCTP is under the covers getting a lot more use than it seems, still today. However all WebRTC implementations usually bring their own userspace libraries to implement SCTP, so they don't depend on the one from the OS.