A feature that will not do anything unless you explicitly press a button to start using it is quite literally opt-in, though? Opt-in doesn’t mean “I won’t even know the feature exists without hunting through the settings”. It just means that it won’t start doing things without your consent. Presenting a way to provide that consent in a more visible place than buried deeply in the settings does not make it opt-out. It might be a bit annoying to you, but it has no effect on your user choice or privacy, especially if there’s a way to globally hide it and any other features like it, including new ones that might be added in the future.