Well, your domain, not a "subdomain" would come from a domain register like Name Silo or Name Cheap, etc. I would never use my host as the register for security reasons. I use Name Silo and they are pretty good. You won't get a free domain. That you have to pay for. It's about $10 American a year.
With free hosters they really aren't that good. As they say you get what you pay for. I've used this service before. https://x10hosting.com/ It was alright, but PHP mail doesn't work. If your site is PHP driven that could be a problem.
Sorry, we're not able to accept your registration. We are not currently accepting new users from Poland. Please try again at a later date. We are expanding our allowed country list in the upcoming days.
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This list is the same scam ....
I have not come across it yet. These stons are themselves scam artists, ****ing scammers and just phishing out the registration data and the registration is not getting literally anything !!!