There's a long history of consumer activism successfully forcing companies to change. We have power. Hell, we've even toppled government regimes this way (looking at you South Africa).

Both the EU and the US are already looking into Apple.

Here's the CTO of the Hey app and the chairman of the US Antitrust Subcommittee discussing this very case yesterday: https://www.theverge.com/2020/6/18/21295778/apple-app-store-...

These "nothing's going to change, why even try" attitudes are so lazy. Absolutely things can change, but surely not if we don't try. Microsoft was massively impacted by the antitrust action against them, every decision they made since then has been run through the lens of that verdict (I know lots of people inside MS) and it fundamentally changed their culture and reduced their stranglehold on the industry.