Climbing roses are definitely the result of human intervention, typically
hybridized from rose species that are sprawlers or ramblers by nature and
generate long, flexible canes.

True vines, many of which have very natural origins, will adapt themselves
to their local environment and grow on/through/over whatever other plant
material is available. If no other plants around, they tend to be sprawling
groundcovers, but there is usually always a tree or shrub or some sort of
woody vegetation in the proximity to clamber on.

Thanks for the explanation. This makes sense now.

Jay Chan