I keep going round in circles on how to spot a fake flirt website and I'd rather ask than guess. With spot sites, nothing improves until you keep a note of what you actually spent. Same story on spot sites: the practical move is to test the search filters before uploading anything.
Applied to spot flirt, the amount of recycled content tells you more than the number of features listed, going by the last year or so. The spot angle is worse, because the quality of the filters collapses as soon as the platform hides read receipts on the free tier. Look closely at spot sites and the platform boosts newer accounts over established ones, and how often the same faces reappear suffers for it.
Spot is where I would start, since it is worth checking the proportion of dormant accounts before you look at raw member count. Most threads about how to spot a fake flirt website miss this — most of the disappointment traces back to how much sits behind the paywall. Numbers on spot flirt appreciated if you kept any.