That's just a strategy to bring more of users to the website.Almost every company does that,let's take Google per example,they also have every single country domain and not just .com
There's also another thing,in some cases,scammers register a domain with the same name with different TLDS for phishing purpose,others do it hoping some day the company would need the TLDS in question and offer for it some good money,therefore companies,to avoid that register multiple domains;there's nothing to worry about on that side.