SEC - CBS went into the season knowing that their rights agreement for the SEC would be expiring in a few years, though the formal announcement by Disney didn't come until December. They came into the season choosing more games up front and airing less games.
The ABC appearance for the SEC was a unique circumstance where an ACC game was canceled that morning and CBS had already had their SEC game canceled for the week and replaced with a Mountain West game. ESPN had a SEC game already and since CBS was dark for the conference that week, it appears that there was no issue with ABC airing it.
The large decrease in football games on ESPN/2/U is a bit surprising but, similar to the ACC, I believe it was done to keep SEC Network fully stocked as ESPN could draw from so many other places to fill up their other networks.
Continuing a theme that you'll see for most conference, the basketball numbers for linear TV were pretty close to pre-pandemic levels. Digital was often sacrificed to keep those numbers up.
Sun Belt - Much like Conference USA, the Sun Belt benefitted from the late start of several Power 5 conferences, filling holes on Saturdays and on ESPN's weeknight schedule. 2020 would have been the first year of a new rights agreement to have a slight increase in games, but they really took advantage of the decisions that other conferences made to postpone their season's start.
In men's basketball, the majority of games remained on digital outlets like ESPN+ and school produced platforms, but there was a slight uptick in games on ESPN Networks linear TV (4, up from 2).
WCC - Our final conference is the West Coast Conference, who has three national linear TV partners in ESPN Networks, CBS Sports Network and Stadium. Stadium also backs the conference's streaming service, WCC Network, and provides out of market streaming for most non-national TV games.
And while the conference consistently scrambled to have games available for schools to play to feed the mouths of those TV partners, they mostly matched the previous season by...you guessed it...taking from their digital inventory when they had to.