There are many LLLLL.com available. In terms of dominance I see it like this .com is miles ahead of anything else for any profit-making business in U.S. and A. then .org for American non-profits, .net for American pharma, finance, space exploration and tech companies, also that same order for other countries trading with U.S. and A. But for other countries trading only domestically it's a totally different ball game so .com, .org and .net have far less dominance or relevance. Surprised nobody has mentioned .ai so far if we're talking about the future.