What could be worse than having a dating app make it possible for everyone else to pinpoint your current location down to less than a meter?
Oh, have it be a dating app for a sexual orientation that is still illegal in many countries.
It appears that Grindr has had this vulnerability, and have been made aware of it, for more than 5 years.
(twitter)
I think GDPR might be a thing to consider here, as well.