Printer doesn't look to be designed for PLA, pla needs a fan directed at the print, but still shouldn't jam, will just get sub perfect prints.
The fan on the hot end, is it always on? as it needs to be on or PLA filament will get jammed at top of hotend. (needs to be cool before it hits PTFE.
Mostly im guessing its just a shit hotend... on the cheapest printer Ive yet seen.