[kilburn]

> 1. Do they limit the freedom of the developer to keep source code private?

There's a clash between user's and developer's freedoms: if a developer is free to keep the source code private, then said software's users are not free to study, change it, and distribute those changes.

The free software movement prioritizes user's freedoms (the 4 essential freedoms [1]) over developer's freedoms. You seem to do the opposite.

> 2. Do they make it harder to sustain a living wage through the labor of writing software?

Your wording makes it hard to answer the question. If you get paid purely to write software, it doesn't matter if said software is free software or not. If you sell software copies/licenses to pay for your development, then it is objectively harder to earn as much.

[1] https://www.gnu.org/philosophy/free-sw.en.html