A significant part of this is probably just the hockey-stick growth in the price of memory we have seen in the past 6 months. Would be surprised if this wasn't impacting their bottom line for maintenance.
There is another factor at play here: EU hosting providers that are not owned lock, stock & barrel are few and far between and Hetzner has a very nice sales representative in the White House.
Here's to hoping the IOU purchase orders for RAM and SSDs get cancelled... Though I think folks are hedging that this will happen and limiting new suppliers.
RAM increased the most, but also SSD and HDD prices increased significantly. And it seems there are also supply problems, so you can't even be sure if you get the components you want at higher prices.