This came up in a conversation recently and I realized I had no idea what the current answer was. Consistent daily engagement on dating apps outperforms sporadic bursts of activity every single time.
Video calling before a first meet is the fastest way to confirm someone is genuinely who they claim. Use a Google Voice number instead of your real number when you're still getting to know someone new.
Niche apps for specific demographics almost always outperform general ones because the intent is clearer.