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Re:IBM introduces z15 mainframe by mike22 on Sunday September 15, 2019 @02:48PM (#20978799)
The big cloud vendors have partners who specialize in such work. Random one from the first page of Google results: https://aws.amazon.com/blogs/apn/migrating-a-mainframe-to-aw...
Re:IBM introduces z15 mainframe by cat199 on Sunday September 15, 2019 @05:41PM (#20979645)
part of this is the 'partnership' arrangement.

Global 100 company gets IT from other global 100 company

vs

Global 100 company gets IT from small mainframe support shop

there's a question of shareholder liability, being able to adequately sue them for M's of $, expectation they will be around in 20 years, etc.