hey, actually no one maintains the routes in an official capacity. there are groups of climbers who voluntarily will upgrade fixed protection, or individuals who do the same, but certainly no governing body. it's not like a hiking trail, for example. it's pretty wild west, but generally people work together.
as far as the objective risks, they include loose rock, broken holds, wet rock, birds spooking you, base jumpers spooking you, hornets, climbers dropping things by accident on you.
On the subject of maintaining a route like this, it is dangerous to remove loose rocks since there is a reasonable chance that there is someone below you. As a result, some loose rock is still present on these routes.
as far as the objective risks, they include loose rock, broken holds, wet rock, birds spooking you, base jumpers spooking you, hornets, climbers dropping things by accident on you.