The big clouds - AWS, GCP and Azure - all have utterly ridiculous egress fees compared to every non-"cloud" hosting service and compared to what ISPs charge for these kinds of connections. For example, AWS charges $90/TB while a typical price is more like $1/TB.

It's almost certainly done on purpose to discourage you from switching away, and in the hopes that you won't notice until you deleted all other copies of your data.

The question is why egress costs this much in the first place though. All cloud providers pay for the aggregate bandwidth, but its cost seems substantially lower than what they charge for the traffic volume:

https://blog.cloudflare.com/aws-egregious-egress/

https://www.lastweekinaws.com/podcast/aws-morning-brief/how-...

Also to note that on many smaller VPS providers customers rightfully pay for the bandwidth, not total traffic. So this charging-by-traffic appears to have no other explanation than predatory practices.