That hundreds, even thousands of frames of each teletext page are required to OCR each one is also a powerful tribute to just how astoundingly awful VHS is.
To be fair, this is for recovering data transmitted in the overscan margins of the TV signal - outside of the TV picture - not the TV picture itself.
Use the entire TV signal for data and it’s a different story. Back in the 1980s Alpha Microsystems computers used VHS tapes for software distribution and backups.
