I tried this at one point and it was a bad experience. It was mostly gay men. While I'm not against being friends with anyone who is gay, I very much got the feeling most people on there were looking for something different than I was.
I’ve used it and met some relatively normal (and straight) dudes. You’re right, the majority of the men using it are gay, and often fairly predatory with their intentions, but if you’re discerning you’re able to find folks there to hang out, not hook up.
This is why bolting on a "friends" feature on a dating app wouldnt work. It must be a solely dedicated place with explicit purpose of making friends based on interests to remove the anxiety of "What would they think if I said this?"