Thank you for the question. I’m a big fan of Strike and Jack’s work. I don’t see StashPay as a competitor to custodial exchanges.
StashPay is a low-fee, low friction way to receive bitcoin to your self-custody wallet. Fully peer-to-peer. More on why I’m building it in this post: 

Introducing StashPay, a bitcoin wallet for Freelancers
Today I’m excited to share a new project that I’ve been working on. A Bitcoin wallet made specifically for freelancers and digital nomads.