Thanks for the additional info, @formazione; Vodafone is indeed one of the ISPs that seems to be blocking glitch.me sites. We can’t do anything about that from our end, and we don’t have a good way to contact them about it, but as a customer you may have better luck.
If you’re able to change your DNS server, or to add an additional one, @charliea21’s suggestion of changing to or adding another DNS server to your list would probably help.