This can be foreseen. Bet365 is one of the most famous and well known books in the world and his income is great enough to make his owner one of the richest people. To better understand I can remind you that even Stackoverflow site was sold yesterday for 1,8 billion of dollars. Just and ordinary site. And here we have famous bookmaker service.
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For the records, Stackoverflow isn't just an "ordinary" site. It's a Q&A forum for developers. If you're a developer, you'd appreciate dev threads on their forum. Anyway, Bet365 is a top Sportsbook so obviously more money flows into it compared to Stackoverflow.
While most of the rich people take little to no salary to avoid taxes, she doesn’t seem to care less about it. It’s expected that she will have that much of a salary given how Bet365’s market is insanely big. The dividends alone tells you that the platform is performing extremely well even in tumultuous times like this. Sooner or later though, she would be taking less and less salaries and more on bonuses in order to avoid taxation, just like any other executive is doing.
According to the article, it seems like she has been earning salaries for several years already and don't really care much about evading tax. So I won't be surprised if similar news pops up in 2022 only to see that she still take more salaries than bonuses and dividends.