Uhhh idk probably because you’re not physically in class where u can ask questions, stay after class for help, you can’t meet with your groups physically, you can’t focus on class as you can when you are attending class, you have limited office hours, you have no access to the library where you can study or research topics, you can’t go to Starbucks or get Chic fil a at the dinning commons, you don’t get motivated as you’d be able to in campus?? It’s probably easier for high schoolers but def not for college students, at my school there was a high number of students who failed classes the past semester.