> The Hetzer-equivalent service is Amazon Lightsail,
No it isn't. Hetzner provides full blown linux instances with 2GB of RAM, while the Ligthsail instance type you're trying to compare has a barely workable 512MB of RAM. That's the equivalent of a meager Orange Pi Zero.
The Lightsail instance type that is equivalent to Hetzner's 4€/month instance is sold for 20€/month.
