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Her OF front page shows the total number of likes on her posts. Every time she posts it goes up 500-700. This is down from the 800-1000 she used to get but still represents a lot of money. If you assume every sub leaves a like and nobody tips her thats 600 x $7.99 per month ~ $60k annually. Thats the mathematical minimum, in practice it will be some multiple of that (like 2-3 times but who knows?).
All for the small price of her dignity, her future and her mental health.