500px just banned my account. no explanation, nothing. wtf? i hope it's not because apple pressuring them about porn (nude) images?

From your Model Mayhem account?

I "was" a Flikr guy for several years. One day they put my entire collection on adult status, not whatever they thought was an issue -the whole dang thing. They wanted me to beg to get it all back.after fixing the status of whatever unknown random offensive image that caused all the fuss.  I instead removed myself from pro status and never uploaded another image there again.

I was thinking of trying 500pix. Seems possibly a systematic issue everywhere.
The world has gone to being complete pussies.