#2 Why they should: Big boost for rival promotions
Brock Lesnar has been one of the biggest draws, not just in professional wrestling, but in mixed martial arts as well. Both UFC 100 and UFC 116, which Lesnar main evented, were two of the highest selling PPVs in UFC's history at that time.
While Lesnar isn't exactly the hottest thing in WWE right now, him jumping ships could do wonders for whichever promotion he signs for.
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Earlier there used to be a tug of war between WWE and UFC over Lesnar's contract. However, with the emergence of AEW, rumors of them going after the Beast have also surfaced. Indeed, Brock Lesnar going to AEW or any other wrestling promotion will attract many casual fans.
Lesnar's popularity can prove to be a massive boost for these budding promotions. While WWE already has many wrestlers unhappy with their status in the company, they cannot afford to lose a star as big as Brock Lesnar.