@Molot yaa the restriction is removed except Stack Overflow, Server Fault, Ask Ubuntu and Super User.
For more info check here http://meta.stackoverflow.com/questions/111388/new-users-and-attaching-images
We examined this issue and decided that on most sites, the restriction is doing more harm than good. The restriction has therefore simply been removed on all sites except Stack Overflow, Server Fault, Ask Ubuntu and Super User.