How? If you like playing Warhammer, go to Games Workshop. If you like climbing, go to a bouldering gym. I appreciate that there are probably some counter examples. But part of this, in my mind, needless demand for tech spaces to meet other hobbyists is catering to an over-reliance on technology. Yes, there are reasons you might want to screen people or groups - for instance, women looking for safety. But surely the existing tools for such a problem are good enough? Instagram and Facebook groups? Or Reddit or Hacker News? The problem is people become chronically attached to these services and convince themselves they need them to function socially. Which is complete myth.