We are under surveillance 24/7, so the open source platform really makes any difference when the device we are using it to access itself collect all those data and sending it to whoever they wanted it?
Maybe we need a decentralized ecosystem as well so there we may experience the complete freedom.
You're correct but that's kind of a self-defeatist point of view. I think as of say the past 6 years or so, it's not a question of giving all of your information to powers that do not care about you or going completely off the grid, but rather one of limiting information when possible and within your tastes.
For example, if 1/10 is living in the woods and 10/10 is putting a literal human tracking device on your beaming every single action you make directly to your government and Big Tech, you can choose to say be a 3/10 or a 7/10.
This can be done through multiple different actions. Perhaps someone chooses to use a cellphone a lot but uses a quality phone with quality apps. Or perhaps someone else avoids Big Tech and uses open source options when possible. At least they have the option to do whatever. How much of an impact does that all have? It's hard to say, but it certainly can't be bad.
And if people don't stand up for decentralized technologies, then you eventually lose the ability to even discuss optionality like this. Money has been fought for with BTC and ETH. But social media has not been fought for. And I hope that that barrier is crossed one of these years when people start waking up to the nonsense brought on to them by governments and Big Tech.