there’s certainly a camp in FOSS that considers “whatever you like including commercial activity” to be the one true valid version of “free software”
like… if someone wants to take an MIT project, add a bunch of extra features to it keeping some available only with payment, and contribute back bug fixes and some minor features etc, i wouldn’t necessarily say that’s harming the project and this is overall a good thing? it gets the original project more attention
like it’s perhaps a little unfair, but if the goal is quality and scope of the original project - or even broader of the goal is simply to have technology AVAILABLE even if it is with a few - then that goal has been met more with an MIT-like license than it would be with a copyleft license
that’s only partly true:
economically liberal indeed means free markets and capitalism (this is why the australian conservative party is called the Liberal party)
however liberalism as a whole includes individual rights like human and civil rights, secularism, etc (this is what the US tends to define as liberal)
it’s an overloaded and imperfect term for our current global political cultures
similar applies to left and right wing:
the left are supporters of change and generally change that supports less fortunate and leads to less social hierarchy
what both these things have in common is that liberal and left wing are about change and new ideas, whilst conservative and right wing are about maintaining the status quo (or as is more currently the case, regressing to a previous status quo)
https://en.m.wikipedia.org/wiki/Liberalism
https://en.m.wikipedia.org/wiki/Left-wing_politics