As with any card game, Yu-Gi-Oh sometimes has decks that are so overpowered that their parent company has to do something about them. Sometimes Konami bans certain cards to weaken a deck so it isn't as dominant. Other times they'll limit a card, allowing players to have only one in their deck instead of three to reduce the consistency of finding or playing it.
Source：https://www.cbr.com/yugioh-banlist-update/
