I recommend you read "careless people", the book about Facebook, where it is documented that Facebook illegally installed spyware alongside the Facebook app on the smartphones of their users. They monitored the apps their users where running alongside Facebook, which allowed Facebook to not only monitor all competitors but also see the rise of WhatsApp, which ultimately led to the "surprise" acquisition of WhatsApp.

Not to mention that Facebook and Google unknowingly ingested phone contact lists from smartphones of their users on a massive scale. So their "advantage" was extremely unethical behavior, which today would be considered an illegal crime.

So yes, it is literally Apple and Google stopping my European company to do the same, because they make it really hard to leech user data from their platforms.

> nobody is forcing you to use them

Do you remember internet.org? There's an interesting section in "careless people" about how Zuckerberg was working on bundling Facebook with smartphone contracts so people can use it for free. One country rolled out Facebook for free and it resulted in the Rohingyan Genocidg because Facebook enabled unchecked fake news along religious divides, while over years ignoring all warnings about the problem.