I have to wonder what your image is of the person you're addressing with your email.
Perhaps you imagine someone running a business, who depends on Wordle for their livelihood.
Perhaps you imagine a dedicated staff of software engineers, a Team Wordle, 12 people with 8 hours a day to devote to improving and deploying Wordle.
Perhaps you imagine an independently wealthy person, who can spend all time as though it were leisure time, and who could, for example, simply reimplement 10,000 lines of Java in some other language, for some other environment, having none of the same features or benefits of Java.
The person you're actually addressing is none of those. He's a person with a family, and a full-time job, who ten years ago ago made something that seemed useful and fun, and got permission from his employer at the time to make it freely available. As Java has become unsupported in web browsers, Wordle has become more difficult to use. And when Java in the browser is dead, Wordle will die.