I'd assume the financial impact is from increased costs for traffic. For Hetzner's customers traffic is somewhere between free and $1/TB, compared to AWS's $90/TB. Hence Hetzner hosts a lot of high traffic websites, and their margins on traffic have to be pretty slim. And with the cheap low-latency connection between the DCs some customers are bound to run a lot of traffic between servers in different Hetzner DCs.

Now I don't know what their peering agreements look like, but it seems like they normally route everything through Frankfurt's internet exchange and now have to take some different routes.