Great! While we can argue over whether not changing an app icon is immoral, it is your prerogative to make that trade off. Let’s just not pretend the tradeoff doesn’t exist.
> I remember it being considered a problem for the seller if a potential customer does not like offered product.
That doesn't sound like making a informed tradeoff, that sounds like the adage of "The customer is always right", which is a very different approach to business.
I highly doubt any company making a statement by changing their app icon hasn't considered the impact and I'm sure is actively watching metrics like uninstall metrics. And I'm sure given they're making the change they found it an acceptable trade off.
So in short, I don't really understand what you're point was trying to make, unless you disagree with my premise that the companies made an informed decision to modify their app icon?
My morals are not for sale.