Seconding what Mike_T said, with one caveat about legit dating sites for free.
The thing nobody mentions about the app is whether enforcement is consistent or random.
I gave legit dating sites for free about 2 weeks before I formed a view, mostly watching how many obvious fakes survive a week.
Provided whether people reply or just collect matches holds up, it is a reasonable place to start.
For a second opinion I also cross-checked DatingFly if you want a smaller pool.