2. Sanctions for going over squad cap limit
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Up until two years ago, the only sanction for going over the squad limit, even for a minute, was a one month transfer ban.
Some people felt that a transfer ban alone was too lenient, and that it encouraged some managers to game the system by taking a ban in order to win one of the almost daily 'new player lotteries'.
A new sanction was voted in - that anyone going over the squad limit has to sell the player that took them over the limit.
As you can see from the number of managers banned since then (almost one every two weeks), I'm not sure it's made much difference (I don't have a record of how many or how often managers were banned before).
What it has done is to ensure that no one can possibly gain any benefit from going over the squad limit.
But in doing so, it has punished pretty much every manager for honest, genuine mistakes, including some who were not bidding on new players at all.