I guess this could be a more common issue with zip, but any TLD could also be a file extension so in that sense this isn't a new problem
Yes, but TLDs like this increase the attack surface of the system, making it easier for bad actors to exploit bugs in networked software or craft phishing-style attacks (including more opportunities for typosquatting). While com/net/org/country only was too spartan, I see the modern TLD free-for-all as a Bad Thing.