The Rick and Morty season 5 finale revolved around Evil Morty's quest to escape the Central Finite Curve, and a fan theory helps explain the real motive behind the Curve’s creation. First mentioned in Rick and Morty season 1, episode 10, the Central Finite Curve is yet another one of many multiverse-related concepts the show has developed. With Rick and Morty season 6 still far away, it remains only to theorize and conjecture about what has already been presented about the Curve — and how it might affect the future of the show.
Despite being introduced early in the series, it took quite a while before the Central Finite Curve concept was brought up again. Behind Evil Morty's master plan, virtually the only running story that Rick and Morty's episodic format followed, was the character's desire to cross the Curve. While Evil Morty succeeded in his plan, it's still a mystery what’s on the other side of the Curve, and why Rick created it in the first place.
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Evil Morty believes Rick C-137 created the Central Finite Curve purely out of selfishness and to make sure no one, including none of the infinity Mortys, would ever have access to a universe in which Rick wasn’t the dominant lifeform. However, according to a fan theory (via Reddit), the reason behind the creation of the Curve comes from a good place: Rick C-137 wanted to protect every other Rick who hadn't lost their wife and daughter, and thus didn't 't become a narcissist genius, from the dangers that the genius Ricks of the multiverse could bring. The Curve would be a way of ensuring that at least some Ricks, Dianes, and Beths could have a normal life.
The Central Finite Curve was the most elaborate and secret
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