Chloe28 covered most of it. The bit I would add on free casual dating sites is below.
Anything I recommend around that one has to clear one bar, which is what the free ceiling looks like in practice.
Out of roughly 30 matches on that one, 6 turned into an actual conversation.
If you bounced off this before, revisit it and check what you lose by never upgrading first this time.
What decided it for me with free casual dating sites was whether the free version is a demo or a product.