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FWIW you can still get Teletext over MPEG TS (DVB or IPTV), it's just already de-modulated, but even error correction bits are still there (and are useless).

In France most IPTV operators still use teletext for live subtitling because it eats much less bandwidth than dvbsub

The ITV/C4 service was originally Oracle; this was later replaced by “Teletext Ltd”.

https://en.m.wikipedia.org/wiki/ORACLE_(teletext)

Ah, my apologies then. My confusion was that I didn't think there was a difference between the current mechanism and the old one.