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It has ads unless you pay to remove the ads, which is a perfectly reasonable model for an app to use.
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Imo that’s pretty unethical. If you don’t want ads, use an app where the maintainer has decided not to include ads or not to charge.
But don’t take something from a sole-developer (meaning in this case labor is actually getting all the fruits of their labor instead of a CEO), use one of the other options instead where the developers aren’t using it as their main source of income.