I don't use any of these apps or sites but I'm of the opinion that if someone is so shallow as to filter you out by your height then you wouldn't want to waste your time with them anyway so they are helping you out.
Also I see this talked about all the time online but I have tons of friends who aren't 6 foot and get dates and attention right and left my whole life. I'm 6'2" and I never felt like I had some absolutely advantage that helped me out just because I was over 6 foot. It's such a dumb metric.
PSN ID: sled_dogs76
60" Pioneer Kuro Elite PRO151FD, Yamaha RX-V3900 A/V Receiver, Oppo DV983-H player. Coming soon: 2 Seaton Submersives from Mark Seaton