Its called a rotating proxy. Some paid proxy providers have a pool of datacenter and residential proxies in a rotation for every request. Fortunately they would get in a captcha loop if every request. There are ones that rotate every 5 minutes and they do exist. there is even a script to set an android phone to act as a rotating proxy by disconnecting and reconnecting to your isp every request. This is mainly used for faking hits and such. I recollect they use vpns for shilling it seems. Fortunately they are not securing their dns and using mobile devices so they aint hiding. No one is.