There is nothing to do with intelligence. They got on radar of Russian government. Which wanted Hetzner to follow Russian law and move all Russian data to Russia in order to operate with Russian citizens. Means literally Russian government expects companies to open data centers within borders and keep all the data inside the country (they even issued a law for that). Obviously Hetzner doesn't want to do so.

You can find the full list of "lucky" companies in here -- https://236-fz.rkn.gov.ru/agents/list (sorry, it's in Russian, but google translate should help you out).

Thanks for mentioning, this is fascinating. The original report is a masterpiece of forensics investigation. Worth a read: https://notes.valdikss.org.ru/jabber.ru-mitm/