Ask HN: Why do indie software projects ask for donations instead of charging?

I found this neat mouse utility today: https://neatdecisions.com/products/neatmouse/

I looked for a price. None.

Just a request for donation.

I find this often with the tools we software developers and engineers are most likely to use.

As software developers and engineers, we're among the wealthiest humans on the planet.

The companies we've built are among the most profitable in human history.

So, why is it so hard to ask us to pay for a product?

Why do we force each other to beg for donations?

It's just mind-blowing.