Google left because their main business is collecting information about people to sell them ads later, China did not allow that - thats why they left, they did not leave because of their great moral stand.

That isn’t true at all. First, China allows collecting similar info about people as in the west, and all the Chinese internet companies do it probably more aggressively than their international counterparts. Second, google left china (search market) because the Chinese government was hacking gmail accounts to root out dissidents.

Google left because China hacked them: https://www.google.com/search?q=china+google+hack

you mean the company named google that literally pay no tax to countries where it is making big $? check news, countries like UK and Australia were forced to come up with google tax to fight such criminal offences.

https://en.wikipedia.org/wiki/Google_tax

Any source to back up this claim that China wouldn't allow that? I find it hard to believe.

Any source about China not allowing collecting information?

Google was getting their butt kicked by Chinese competitors, namely Baidu. They weren't exactly making tons of money anyway. So they gracefully did a PR move and pulled out of China.

Google surely wasn’t as good as Baidu in scamming terminal cancer patients with the help of the PLA.

Going by that logic, it should even be more easier for Apple to leave China. They are also getting their butts kicked by the local Chinese firms.

Apple makes a lot of money in china. Much much more than local Chinese mobile phone producers. Huawei might sell more phones than Apple, but their margins are slim to negative.