Originally Posted by happycheapskate
A lot of low-end bikes use a rear derailleur with its own hanger built in. (usually found on bikes with long horizontal dropouts, using a solid axle).
Sure, I'm familiar with those. But that bike pictured never had one mounted, and if you were to mount a hanger like that, you'd compromise the strength of the dropout. That bike pictured is more suited to internal hubs.