As for everything else, AWS offers tiered pricing for everyone and it's the same for everyone. They just don't publish the tiers at that level, but yes, Netflix pays less than you probably do because they're in the higher tier -- but they pay the same as all the other companies at that tier.
They do offer the Snowball to lower transfer out cost, they also offer Direct Connect which is more convenient and can be cheaper.
For sure it won't be cheap, but being able to transfer 100 TB for less than 3k isn't too bad. Storing that on S3 would cost you nearly that per month... if you can't spare a month of cost to migrate, you may want to rethink your pricing.
They do for both Snowball and Direct Connect, but it's 2 cents per GB, which is what I used to give the 3k estimate.
Third party SaaS offerings that move large amounts of data are effectively forced to host in AWS.
Want a small number of high-value servers (e.g. big GPUs, etc) in your own data center or colo to use for non-availability-critical purposes integrated with the rest of your AWS stack? You’d better price in egress!
Want to gradually transition to a competing cloud? Good luck, egress will bankrupt you before you finish the transition.