I recently cancelled my service with IONOS. I was just on a basic shared plan, but I found the performance unacceptable. They don’t use cPanel, if that’s important to you. Their upsell attempts are full of dark patterns. When you cancel your account, unless you are very forceful, they want you to CALL them to confirm or they’ll attempt to keep billing you.

Just one person’s experience, but it wasn’t a positive one.