Also Wasteland isn’t just the inspiration for Fallout. Fargo wanted to make a sequel to Wasteland but no longer owned the rights to it, so they tweaked it into what we know and love.

According to Tim Cain on his YouTube channel, not exactly. Cain was a fan of Wasteland which lead to some elements (mainly he liked the idea of morally ambiguous quests more than anything) being in Fallout, but Fallout wasn't developed as Off-Brand Wasteland. Some time in development, after Fallout had been pretty crystallized there was a discussion by the studio about getting the Wasteland rights and reworking Fallout into Wasteland 2. That ended up falling through. I believe Cain has mentioned being relieved because Fallout had turned into a unique creation, and it was already having to deal with one license for GURPS so having the Wasteland license would have doubled the amount of people looking over his shoulder.