This (EDIT: this app) is iOS only right now. And I hate the normalisation of giving websites access to Bluetooth and NFC.
The guy wants people to meet in person rather than doing social media the normie way.
For the record, the feature you describe was first introduced on Samsung phones 14 years ago - and later removed, likely after poor adoption. Because Apple "reinvented it", it's now planned to be reintroduced on Android too.
Starting a network effect product like a social network where you exclude half the social graph seems like... quite a decision.