Clickbait, as usual.
How to get diamond membership a month for free or 50% off for a year
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Sounds like it's slightly dishonest. I wouldn't cheat the system for premium membership... As great as that would be.
https://www.chess.com/blog/GM_Kenny_Ji/how-to-get-diamond-membership-a-month-for-free-or-50-off-for-a-year