Because of:
and other awful things SE company is doing.
Before you ask a question...:
If you enjoy Electronics:
Should one of my students read this...
Yes, I know you can get help for your homework from the Internet , but I usually get you ... sooner or later.
Once a former student of mine managed to smuggle a smartphone in the classroom during a written test . After reading his test it took me about 5 minutes to find the exact URL of the crap he put on his sheet (20+ years-old pre-standard C++ code with non-standard includes).
Remember : Internet is full of free stuff ... and crappy stuff is particularly free . Thus choose wisely what you are "borrowing" .
Of course feel free to learn from what you find on StackOverflow (and other StackExchange network sites)! You could manage to outsmart me and get better grades!
Happy Coding (or SW/HW Hacking)!