Have 600,000 modders lost Xbox Live access in Microsoft cull?

Reports are starting to emerge online that Microsoft may have initiated a cull of Xbox Live accounts belonging to users of modified games consoles. One claims that a "trusty source" working in a call centre which handles Xbox 360 accounts has had an influx of "screaming teenagers who don't don't understand the terms of use that comes with the console they bought". That same posting suggests that as many as 600,000 Xbox Live accounts across North America have been disabled so far.