Illinois played on network TV against way more popular opponents twice (after being on network only twice in the preceding five full regular seasons), whereas South Carolina wasn't on network TV at all, and that dumb methodology counts their game exclusive to ESPN+ as a zero.
The eyeballs are in large part just a function of what channel you're on and when. That's why the deal that is the subject of this thread is was so sought after by the league.
And anyway, to compare apples to apples, both teams had one conference game that was an 11AM start on ESPN2. UI/Minny week 10 was 595k viewers, SCar/Tenn week 6 was 795k.
UTSA/Illinois got a zero rating and had only a quarter of the viewership as a same week Boise State/UCF game that started at 9:40PM on a weeknight.
College football TV ratings for the 2023 regular season, bowls, College Football Playoff and National Championship.
www.sportsmediawatch.com
Lots of fun to peruse, check it out.
Tennessee also has a massive fan base that probably accounts for AT LEAST that difference, if you ask me.
If I were to offer a semi-educated guess, I would wager that if you looked at historical data, Illini football TV ratings fluctuate drastically with how good we are. Most bad teams don't get good ratings anyway (mostly due to not being on good channels at good times but also due to fan apathy), but I would suspect it's especially the case among our fans, especially in the state of Illinois. I don't have as good of an example for football because we aren't exactly "good" yet, but look at how our basketball TV ratings progressed as we got better (just picking a few examples):
2018-19
Tuesday 2/5 vs. #9 Michigan State on ESPN2 at 6:00 pm -
549k viewers
(This was that upset win Ayo's freshman year, BTW.)
2019-20
Sunday 2/2 at #18 Iowa on FS1 at 12:00 pm -
628k viewers
(Yes, it's on a Sunday, but we drew more on FS1 than ESPN2....!!)
Thursday 3/5 at #19 Ohio State on ESPN at 6:00 pm -
944k viewers
(This one was on ESPN rather than ESPN2, but a huge increase still.)
2020-21
Wednesday 12/2 vs. #2 Baylor (Indy) on ESPN at 9:00 pm -
1.04M viewers
(Primetime matchup sure ... but 9:00 pm for both teams makes that a GREAT rating.)
Tuesday 3/2 at #2 Michigan on ESPN at 6:30 pm -
1.57M viewers
(Michigan has plenty of fans, but this is an exceptional regular season rating.)
Saturday 3/13 vs. #5 Iowa (BTT) on CBS at 2:30 pm -
2.89M viewers
Sunday 3/14 vs. #9 Ohio State (BTT) on CBS at 2:30 pm -
3.68M viewers
(This one more proves the point that the way to get "good ratings" is to play at good times in meaningful games on big-time channels.)
Sunday 3/21 vs. Loyola (Chicago) on CBS at 11:00 am -
6.16M viewers
(This was the second highest watched NCAA game of the Second Round.)
Point being that it's fan enthusiasm, game times, channel and the relevance of the game that dictate your ratings - at LEAST as much as the size of your fan base. I do not think there are that many more Illini basketball fans in 2022 than there were in the fall of 2019 ... we just have a reason to reengage, and the Illini are on better channels at better times.
On a similar note, I think we have a lot of football fans, as well. However, many are not going to tune in if we are already 3-8, and neutral fans cannot be expected to care about a bad Illini team, either. I cannot find historical data on our regular season games during our 2007 Rose Bowl season, but I am willing to bet our ratings were pretty good.