I always think about paying for the open source software that I use and I try to be more dilligent in paying for it.

The problem for me is, that while calculating how much I theoretically should spend on the OS I use for example (gnome+fedora+linux kernel,etc), it would be actually cheaper to pay for a windows version+microsoft cloud/office suite or switch to the apple ecosystem.

Same applies for programming frameworks I use.

Doesn't that mean opensource is inherently impossible to use ethically as a private person?

So how do you decide on how to deep and how much one should pay?