It wasn't built specifically for LinkedIn, it fills in the text from the URL: https://idont.date/people.who.indent.with.spaces
But still, the thought of being propositioned on LinkedIn makes me shudder in discomfort.
Also, some boundaries are socially fluid; some people think it's grossly inappropriate to use what is obviously a professional contacts site for romantic contacts, and some people (https://futurehappyself.com/2017/09/24/i-met-my-husband-on-l...) do not.