It is very simple. If you move your data off cloud provider X, cloud provider X is losing revenue because you are doing things with your data off their platform.
They therefore charge high fees to move your data off the platform to discourage this behavior. Meaning you now need to use cloud provider X’s services to do anything with the data.
Attempts at vendor lock-in have been core to software service companies since they were born.
Right but if this were the case then why does the Bandwidth Alliance allow you to move data at a much lower cost for 2/3 of the major cloud providers? If they _really_ cared so much about not allowing you to do processing with a third party, the Bandwidth Alliance wouldn't exist!
AWS is the sole hold-out here, and I think the way that Cloudflare worded this makes it pretty clear that the Bandwidth Alliance is basically a middle finger to AWS than anything else, but it also seems clear that the cloud companies aren't actively trying to make it costly to do data processing on a third party.
In fact if you want to move off GCP right now, Google will waive all egress fees to do so: https://cloud.google.com/blog/products/networking/eliminatin...