Honest question: would a client-side implementation be OK? As in, the only person making any requests to the CL servers is the end-user, and then a browser ext

Honest question: would a client-side implementation be OK? As in, the only person making any requests to the CL servers is the end-user, and then a browser extension/app maps the listings? Is it wrong to automate calls to CL's server from javascript in a local app? If no one else is doing a client-side padmapper, I sort of want to myself.