From a 2017 interview with Matt Sweeney
Quote:
He was in Zwan with Billy Corgan
“We had a friendship from before he was famous. One on one, we had a pretty great thing going. We had a great year were we made like a hundred songs. Nobody’s ever heard that stuff. But once it went public, everything was different. I was confused, it started to feel like fulfilling a commitment where the game had changed. It was interesting, I’m still sort of unpacking that experience. We all had to sign confidentiality agreements, so I can’t really talk about it”
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http://www.radionz.co.nz/national/pr...y-pop-to-adele
For years, I thought the NDA thing was speculation, but he confirms it here. I'm sure all the members of Smashing Pumpkins from 2007 onward have signed them as well.