They do, but not at the level that Samsung, Google and the rest does. Main difference is that Apple does not sell what they collect.

I need a working, synchronized, ecosystem that is safe, reliable and that does not steal my data (harvest). As long as Apple can provide that I will not even look at other solutions

Then don’t, just don’t.

Get it to a repair shop, it’s almost impossible to say what might be broken since it’s been exposed to heat.