Strange that Intis Telecom would presumably want it.com for their own initials and yet they are using it as a faux gtld.
Back in the early 2000s .uk.com domains and similar were quite popular. I think the general population had only just become familiar with .co.uk and .com and so these similar-sounding subdomains appeared to be a reasonable alternative for many businesses who weren't quick enough to register their name in .co.uk or .com. I even remember seeing a hairdresser in Cambridge who had a sign outside their shop with a domain which I think was hair.uk.co - I thought they had misprinted their domain until later I discovered some clever bastard had bought "uk" in Columbia's cctld .co and was selling subdomains.
But nowadays things are quite different. There are so many new tlds as alternatives, it is relatively easy to find good taken domains up for sale and of course in this country you have 2 chances to get your keyword(s) in a UK domain with .uk and .co.uk. I can't imagine ever wanting to buy a subdomain now.
It also seems a bit short-sighted for a telecom company to not reserve hosting.it.com and any other major telecom/ internet related keywords for themselves in case they want to branch out into that related market in the future.
And why haven't they changed their own domain to intistelecom.it.com? If they don't believe in it enough to use it themselves why should anyone else? Although personally if I were in their shoes I think I would keep the prestigious it.com and
www.it.com for their own website (with a large, unmissable "Register your .it.com domain" ad on the page for visitors looking for that) and keep the .it.com subdomains business on its own subdomain e.g. registry.it.com or something like that.