I keep going round in circles on new online dating sites to watch out for this and I'd rather ask than guess. The spring case is instructive — most of the disappointment traces back to the signal-to-noise in search. Nothing about spring changes the fact that the practical move is to write the bio for one person rather than for everyone.
For spring watch in particular, the signal-to-noise in search is the number worth watching, not the price tag. Spring sites is where I would start, since the platform makes verification optional and then hides who has done it, so it pays to compare two platforms in the same fortnight.
Look closely at spring sites and the platform recycles the same profiles, which explains most of the complaints in threads like this. The part of new online dating sites to watch out for this people underrate is that it is worth checking how often the same faces reappear before you look at raw member count. What has actually worked for you on spring, and what would you avoid?