Ran a proper test on Flamedate after a recommendation. The free version does more than most without immediately blocking you.
My actual evaluation process: does signing up require payment details immediately? If yes, I leave without looking further. Is there any content or activity from the past 48 hours? Older than that and the platform is functionally inactive. Is there community discussion about it on neutral ground — not just on the platform or its own blog? No neutral discussion is almost always a red flag.
Platforms that have built real user communities over years without depending on hype cycles are almost always the safer, more honest choice.