meta: prohibit buying/selling subdomains in ToS

Signed-off-by: orangc <c@orangc.net>

TERMS_OF_SERVICE.md

@@ -3,7 +3,7 @@ Welcome to **is-a.dev** ("our", "us", "we"), a free subdomain service provided t
 
 For questions or concerns about these Terms, please contact us at admin@is-a.dev.
 
-**Last Updated**: 3rd August, 2026
+**Last Updated**: 31st August, 2026
 
 ## Definitions
 The following definitions apply within these Terms of Service:
@@ -52,9 +52,10 @@ You agree not to use, attempt to use, or permit others to use the is-a.dev servi
 12. Proxy or VPN services
 13. Hosting websites on root subdomains that are behind a login page (with the exception of login pages for management reasons)
 14. Blogs that are not primarily related to software development
-15. Conversational AI websites or apps that are similar in functionality to websites or apps such as Claude, Gemini, ChatGPT, etc
+15. Conversational AI websites or apps that are similar in functionality to websites or apps such as Claude, Gemini, ChatGPT, etc.
 16. Any website that is orientated to courses
 17. Video game cheats, hacks, exploits, or unauthorised modifications, including any websites, communities, software, downloads, documentation, or services primarily intended to facilitate unfair gameplay or circumvent game restrictions
+18. Buying, selling, trading, renting, leasing, auctioning, or otherwise transferring or monetising is-a.dev subdomains or the rights to them, whether directly or indirectly, including through bundled services or other forms of compensation
 
 *Note: This list is not exhaustive and may be updated or expanded at any time at our discretion.*