I like what Apple is doing in the App Store and I think it is worth the 30%. In any case, it is good to know other options

Ok, thank you. A MacBook Air M1 refurbished now seems a good value.

If I use dispatch, what is the best way to wake up the computer if it is sleeping?

The answer related to NSTitlebarAccessoryViewController I do not understand. Probably they give as known some steps that I do not know. That is what I have tried: 1- I put a Window Controller from the Library 2- I suppose I have to create a new document? File > New File > Cocoa Class > Class WindowController / Subclass of NSWindowController / Also create XIP NOT selected. How do I connect that with the main window? 3- Do I have to put a button on that new Window controller? 4- I just do not understand the next step: "I connected the accessory view to an outlet (cleverly named accessoryView) in my NSWindowController subclass"

Thank you. I saw that answer before making the question but those options do not work for me or perhaps I do not understand. One answer only accepts some kind of buttons, another seems objective-c? and the other I just do not understand. Thank you in any case. I will try to solve the problem in another way.