If you tried to trademark any of these tlds, it would fail horribly.
TV, ML, IO etc are literally just two letter combinations and they are descriptive by nature. There is no real way to claim ownership on just two letters, especially when they have an accepted understanding as being geographically descriptive.
If you could do this, concepts such as maps would also be infringement.
Additionally, the IANA is who is in charge of assigning TLDs, which is in turn controlled by ICANN. IANA gets to appoint trustees for country code TLDs and has the authority to take that control back.
IANA is based in the United States(though it has stakeholders globally) and has the authority to revoke TLD (unlikely to happen, but well within their rights and control) and more likely, to re delegate control to another authority, if they found the currently appointed trustee to be abusing the control of the TLD.