In the acceptance letter Harry Potter received from Hogwarts, the second page has a list of requirements for the start of school. At the bottom of the letter it states:
PARENTS ARE REMINDED THAT FIRST YEARS ARE NOT ALLOWED THEIR OWN BROOMSTICK
And yet, very early on in his first year, Harry Potter is gifted a Nimbus 2000 by the head of his house Professor McGonagall. This no doubt made Harry Potter the only first year student to be allowed their own broom.
Seems to me that McGonagall was intentionally breaking the rules to benefit her own house, which seems unethical.