1&1/Ionos is one of the largest and best connected ISP and Hosting providers in Germany, not some small shady shop. I see they doubled the price to 2€ though :)
I made a WordPress site for a friend through Ionos's managed offering. After a couple of months of the site being up, they decided to detach the database for literally no reason. I had to go through support to get it back up. I'm guessing it got erroneously flagged as over its quota, but they couldn't explain why it happened. Just my experience.
To be fair, whenever you pay 1-2€/Month for something, you cannot really expect human/timely interaction. Paying a single support employee to look into your case for 10minutes already erases all revenue from the past years from you.
Seems to be a common theme with all the "big" hosting providers. Especially if they offer cheap services. They have an abuse problem so they set up automation to deal with it and they don't care about collateral damage; you're just a number, and not worth their time. Actual proper support costs more than race to the bottom allows for. Same deal as with Google et al, one day you might just get fucked.
Turns out finding a good, reliable hosting provider who isn't a tyrant and gives you the benefit of the doubt & treats you like a human when something's up is really really hard. And probably not very cheap. It's kinda sad that one could host all kinds of interesting things on a $5 device like raspberry pi zero, but then you have to pay out of your nose -- twice, and every month -- to get proper internet access.
1&1/Ionos is one of the largest and best connected ISP and Hosting providers in Germany, not some small shady shop. I see they doubled the price to 2€ though :)