I have a shared hosting plan at one of the biggest hosting company. I host there a 3 sites. Today I just discovered that every site is available under a subdomain of my main domain (that was required to add at the sign up).
samplewebsite.com is available in two ways:
1. samplewebsite.com 2. samplewebsite.maindomainname.com
For me it's simple duplication and I think it is harmful for my sites. The support told me that it's a default behavior for shared hosting with Cpanel and the only way to avoid this is upgrading to a VPS. I tried to delete the subdomains manually, but couldn't do it without deleting the added domain so it's not possible to delete them only if I remove my sites from the hosting plan.
So what should I do now? Do you think Google wont index the subdomains until I don't link them, therefore it's not a problem? Or should I have find another hosting?
I think thousands of websites are duplicated this way just at this company and since it's a default behavior I'm not sure how it affects seo. How would you deal with this?