here he states that the UI is gamified in order to be addictive:

https://youtu.be/Y_ZZv--OI0s?t=865

And here he states that your bio doesn't matter at all, that it 99% about your photos/looks:

https://youtu.be/Y_ZZv--OI0s?t=949

In case you ever need a referrence straight from tinder's own data analytics department...