You know what, if commenter OP finds value in the services offered; and wishes to compensate the author of the software - just gonna say - I have no problem with that.
Considering I already buy books on Amazon, if there's anyway I can just find an affiliate (any affiliate), Amazon gets 5.5% less revenue.
For tracyhenry, they would get ~$8.25 CAD straight out of Amazon's pocket for my $150 purchase.
https://associates.amazon.ca/help/node/topic/GRXPHT8U84RAYDX...
(edit) just scroll down that page: https://pi-hole.net/donate/#sponsorship
People should get paid for work.
Whether that work is having a job. Or making a website.
I don't see the difference...
Someone who does useful work deserves wages.