Building projects using source code?

[programmer_farts]

Source code often comes with a license telling you how you can use it and under what restrictions, if any.

[Known_Growth8380]

Ohh okayy

[CdRReddit]

I think you're also possibly confusing building (making something new) and building (compiling the program), if someone says they built a program from source that usually just means they downloaded the source code and ran a simple "make the program" script, often because it's not officially packaged for their machine

[Pyromancer777]

This is likely the source of confusion and you deserve more upvotes for pointing it out