If you have a giant pile of data already in AWS, that you need to use on a Mac for a short time, it may make more sense to rent a Mac next to all your existing data, rather than paying exorbitant transfer fees to get the data to a Mac elsewhere.
except this would not be the case. we just need M1 instance from Scaleway or whoever provide it as runner / job executor. not much data egress for those traffic.
But none of that code runs on Mac alone. Even if they're developing on a Max their python or Julia or whatever code that they want to run on the cloud will run on Linux. The only real use case out there is building/testing iOS/Mac applications. The only other one I can think of is a Mac only video editing or animation software that you'd prefer to render somewhere besides your laptop.
AWS's transfer fees are a massive lock-in.