EDIT: this story sounds like trying to use the sex-offender thing to fabricated outrage. People who use these apps to "hook up" with strangers should be well aware that they might bump into all kind of bad people (some of them might be lunatics or even criminals). Having the service provider suddenly be in charge of attesting for the (lack of) character of its users sounds like a terrible idea.
>Match Group, which owns most major online dating services, screens for sexual predators on Match — but not on Tinder, OkCupid or PlentyofFish. A spokesperson said, “There are definitely registered sex offenders on our free products.”
"Gig economy" platforms already support this in various forms, due to customer pressure and local regulatory environments.
meeting strangers and attesting for identity is a problem that isn't unique to Tinder/Grindr. It's relevant to any service that spills over into meat-space.
Background checks and ID checks unfortunately won't work for many people not in the US. Worse they will give people a wrong sense of security. IMO training and steering users to the right behavior would be more effective.
Some of these tips could be used to implement a workflow (user stories) around it to make it safer:
 staying safe on Tinder: https://www.vyke.com/stay-safe-on-tinder/