Their trademark predates the .chat TLD (I looked it up on TESS).<p>Nevertheless, your use is arguably different (this distinction matters under trademark law).  You&#x27;re no doubt going to call the business (if it even is a business) something other than TINYCHAT, and are going to have a substantially different trademark.<p>This is tricky (and IANAL), but I&#x27;d simply not respond if you are actually in good faith preparing a different product with a different market.  Simply owning a domain doesn&#x27;t make you a trademark infringer.  There is no dot in their trademark (service mark) name.  They could have included a dotted version in their trademark application, and they opted not to.<p>In addition, to avoid further headaches with those people, consider coming up with a different name for your product, and simply redirect your URL to that different name.