What's so weird about wanting to share your coffee with someone? The screenshot shows someone riding a train -- presumably they are in a distant city where they don't know anyone.
It seems like it would be less problematic to approach a person and ask if they could show you around or, offer to buy someone in a coffee shop another drink rather than using a technical means that allows the other party to select themselves?
Are people this social, and this lonely? "Let me spend this 30 minutes of free time to talk to some random potential weirdo!"