You're not buying apples, though. You're buying "apples+X". That's a different from "apples". If your seller is upfront about that then I and people who want just an apple can go somewhere else for fruit. Most, though, aren't upfront about it.
That is up to our governments to decide if such is allowed or not. For example, it isn't allowed to sell a gun or drugs with an apple (at least not here in The Netherlands, YMMV).
That you can decide to not go for the entire package is not what we disagree on (apart from above, I suppose).
What we were discussing is that the consent is optional; it is not in any of these examples. It is part of the package deal; then you don't call it opt-in or opt-out, as that allows you to opt-in or opt-out of something which is otherwise not in your direct advantage, but is in the other party's advantage.
Let's say there are two people who are supposed to get a punishment. One is found guilty by a fair trial, the other one is not found guilty by a fair trial.
For some superficial rule, I may only punish the person who has been found guilty by also punishing the person who has not been found guilty.
Can you explain to me how this is fair?
Here is where you and I differ. You find it OK when a party (e.g. business) uses your private data to sell or otherwise use for their benefit. I believe such personal data is ultimately my say. And I believe only informed opt-in (optional, not part of a package deal ie. how GDPR works) is a fair way to deal with such situation.