If it’s added as already opted in, I assume they pop something up to make it clear what’s been added and enabled, and how it affects the user’s privacy, with a link to the settings to change it if desired?
If so, that’s not too bad, no.
If they added it and didn’t make it clear, or worse yet didn’t call attention to it at all, that would piss me off.
2019 isn’t some ancient far away time though, it’s just a few years ago. If Facebook were doing stuff like this then, think who else is still doing it.