[Disclaimer: I'm Co-Founder and CEO of https://www.vantage.sh - a cloud cost platform]

On this topic as its relevant, at Vantage we launched an automated cost recommendation that keeps an eye on egress out of Cloudfront and S3 and recommends when it makes financial sense to switch to another provider (in the linked blog post, Cloudflare) https://www.vantage.sh/blog/cloudflare-specific-cost-recomme... -- this has been very popular with current customers/users.

We're actually in process of adding a bunch of new infrastructure and service providers and should include Hetzner in our list of recommended providers but thought I'd mention for anyone wanting an automated approach to knowing when you hit the financial tipping point, this is one option.