Fring on Monday accused Skype of anti-competitive behavior after it blocked the use of Fring for Skype chats. The freeze came after Fring said it had to temporarily stop Skype to accommodate the load from iPhone 4 video chats. The app developer accused Skype's team of being "cowards" by not letting the service come back to Fring and of trying to "muzzle competition" by forcing users to run Skype's official app.