They were simply pre-empted. At one point,
NBC affiliates WRCB/3 Chattanooga, WFBC (now
WYFF)/4 Greenville, SC, WSOC/9 Charlotte (now
ABC), and WAPI (WVTM)/13 Birmingham also carried
the Braves, and NBC programs were simply pre-empted
in those markets.
Channel 17 did carry a couple of NBC daytime shows:
"Jeopardy!" and "Who, What, Or Where," as well as
the NBC Wednesday "Mystery Movie." In the fall of
'72, I recall 17 carrying the second game when NBC
had an NFL doubleheader; WSB carried its 6 PM news,
followed by Lawrence Welk at 6:30, and I assume the
revenue was too much to resist.