The very secure elections that are so secure in some counties that nobody is allowed to verify?
I don't think there was substantial election fraud but I must say America keeps trying to convince me otherwise.
Couple this with media who is unable or unwilling to tell us what is done to prevent fraud (the only thing I have actually learned was from someone here on HN who served at a voting center and had a very good explanation).
For the record: I don't think there was election fraud but I do think that if major media and tech companies had pushed Trump the way they pushed Biden there had been well deserved outcry.
Personally I like Biden more than Trump but that doesn't mean the election wasn't ugly.