Earlier quoted context omitted.
Devil's advocate: you now get a lot of tooling for 'free', which used to cost hundreds or thousands of dollars.
One off few hundred or few thousands is nothing in comparison to 30% tax. That said, I don't know about Mac, but you can build apps using free tools - maybe in not as convenient way, but certainly you can. I remember, because I was someone who couldn't afford Visual Studio licence and had to make do with GNU tools. The greed of these companies put me off from developing anything.
Which leaves the certificate thing and while it’s an annoyance, it’s also nice as a software user to know that a program I’m running is the program it claims to be without much friction on my part, and the cost can’t be that prohibitive since I don’t remember the last time I ended up with an unsigned binary on my Mac, even for free software like TeX and friends or Aquamacs.