That's free as in freedom not beer. So the big difference is that you and the community can look at the code and inspect it. Closed code you are just trusting the company behind it.

There are always ways to support Devs in Foss software as well. Just ask , everyone has somewhere to receive donations. I for one A) want to know what I run on my devices. B) don't like to be spied on C) don't want to support the practice of doing so. And D) I have security and privacy standards. Even if you would trust a one dev closed source project , you are just one hack away from getting something nasty on the next update.