"why not?" - since your program/software won't be appropriate with international programs like Ethereum or Bitcoin where guaranteeing uniqueness of addresses on a world scale could be the A serious aim. This is actually the question you should be inquiring - (ethereum.stackexchange.com/inquiries/3542/�? A vanity address is a singular personalized address. https://vanity-address78654.blogsumer.com/29917595/indicators-on-eth-generator-you-should-know