[ahtihn]

That's not what legitimate interest is supposed to mean though.

Legitimate interest is about collection of data necessary to operate your service.

Listening to detect if someone in a user's surrounding is showing a match without license has nothing to do with the function of the application. There's no legitimate interest there.

[PeterStuer]

It is perverted. Legitimate Interest includes hovering up all your data and shuffle it of to 100+ data brokers who 'legitimately' are interested in that data.