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.
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.