Same here I get apps, messages or people will say so and so told me to join. And when I ask that clan member they're like idk who that is or what they're talking about.
Some people are bold enough to flat out say "I just want titles and emblems". At one point I was recruiting females only, one guy changed his avatar and bio feminine so he could join. How did I find out? Somebody from his old clan members told me via message.
Yeah it can be a pain leveling up your clan - but when I look back it was fun putting in all the work in with other people.