There is a misconception with some regarding ESPN+ and the ESPN app. And it doesn't help that ESPN pushes you toward the ESPN+ paid-nonsense, IMO.
The app you download is the ESPN app. It's free. It offers games to view freely if you already have a paid subscription that includes ESPN through whatever provider. So... if you already have YouTube TV, and it includes ESPN... or you already have Hulu, and it includes ESPN, then when games are televised on SECN+, all you have to do is get on the ESPN app, and choose to watch the game on any feed that ISN'T ESPN+. It will ask who your 'provider' is... you select YouTube TV or whatever, and then off you go. The ESPN app still makes some games a bit obscure because ESPN sucks to high heaven. But, just navigate down to 'NCAA Football' and you will find what you want. Same with baseball and basketball.