I really wish someone would tell them that we can see their course activity... it would save me a lot of emails.
I get a lot of dual enrollment students in my summer course so I am often the one who gets to introduce them to college. The first person to hold them to deadlines and take an actual late penalty. The first person who doesn't accept "I was confused" as a reason why a student thinks they should be permitted a re-do on an assignment they half-completed after not asking a single clarifying question about it. Etc. But the ones that make me chuckle the most are the moments where I get to be the first person to break it to students that we can see what they access in the course on our end.
So, no, dear student who has accessed the course 9 times since last Friday: you don't get an extension on last night's assignment since you "just opened the course for the first time today." Aside from the fact that - even if that were true - you signed up for the course and that's on you to log in for the first time prior to 5 days into the course. But more importantly, here is a screen shot of your user history that shows that you opened that exact assignment 4 different times over the last week. Welcome to college.