"Take the power back" by not continuing to give them your money.
But at the same time, do not pretend that there are not any alternatives. Yes, perhaps those alternatives are not as convenient, but choosing them over the "wrong" choice should be an equal part of the fight.
And "Live in a hut"? Please do not be overly maudlin. We are talking consumer electronics here - something that is still considered luxury - not fundamental philosophies of life or economic models of society.
I disagree. A smartphone is a necessity in this current era. If for example your government requires you to install a Covid tracing app, what choice do you have besides Apple and Android (both of which removed Fortnite)?
Just a few weeks ago there were a bit of news where you could not sign up for a corona test unless you had the bank verififed identification smartphone app installed. When the local government in charge of testing was interviewed, they said that for people without the app they would help them install it. Problem solved.
Some luxury products are very different to other luxury products.