Is this because they are multi-billion dollar companies, or because they behave poorly, or because you haven't been properly compensated for your contribution to the content on the internet?
It is very likely that voting, or voting with your wallet, or probably any kind of activism, would have more impact than withdrawing from the (online) public life.
It is very likely that voting, or voting with your wallet, or probably any kind of activism, would have more impact than withdrawing from the (online) public life.