Yeah I'm not sure why it's nowadays common to simplify socialism as "workers owning the means of production". It's not exactly wrong, but it is often misunderstood.

A company being owned by it's employees is not necessarily "socialism". In today's global capitalist economy, there are worker-cooperatives as well, but they too exist within the capitalist economy and have to follow its rules, which is above all the profit motive. If you don't orient yourself based on profit, you will be out-competed eventually.

Traditionally, when socialists talk about "workers owning/seizing the means of production", they are not talking about individual workers or individual businesses.

Workers means "the working class", which would be pretty much everyone ("the 99%"). Means of production means industry and the economy overall, not individual factories and businesses.

What makes FOSS special is that the software is not privately owned by anyone, not by the devs, not by a couple of programmers, not by a company. It is commonly owned, anyone can use, copy and alter the code however they want without any artificial barriers. This of course makes it a lot harder to extract money from users.