1) Alyssa was given all of Square to run, making her the effective CEO of Square. Jack was never going to give up CEO of Square role in any other way than by taking over a top-level entity. I strongly suspect he hasn't had any interest in the core business in years, though. Given Alyssa's general background in AWS, this likely represents continued platformization of Square, and a continued de-emphasis on Square as a product. Instead an emphasis on Square as infrastructure. How this squares (hah) with their small business moat time will tell.
2) Jesse Dorogusker runs Tidal and crypto hardware, which is fascinating - he's ex-Apple, a solid hardware lead, but to my knowledge he has no music background or industry experience. I wonder how that happened?
3) Mike Brock in charge of whatever the fresh hell TBD54566975 is, is honestly the about 10x as puzzling as Jesse in charge of Tidal. I could not understand this less. The name, the design, the mission, the lead choice, the twitter page [1]. None of it. It's complete nonsense.