Why are "neodinosaurs" prevalent still? (genuine question for people who believe)
From everything I have been able to find Neodinosaurs / any prehistoric animal thought to be living in the modern day is tied back to hoaxes (Surgeon's photograph, Kasai rex, etc) or are inventions of colonial expeditions / exploitation (literally every congo neodinosaur).
I have delved deep on this topic specifically before and honestly wonder why people even think of them as cryptids instead of fantasy. There should be some evidence of them surviving in the fossil record if there were any grounds to these ideas.
For a possible alternative explanation, perhaps its mis-identified animals such as large bats for supposed "pterosaurs".