Wouldn't this be a copyright problem? In essence, i think 90% of your clients would use this service to let you upload a copyrighted movie to youtube... I guess they would at least close your account every time they find out you uploaded content you weren't supposed to upload??? (i have no experience in uploading copyrighted materials without consent, so i wouldn't really know what youtube procedure in this case would be)
Youtube uses ContentID
https://support.google.com/youtube/answer/2797370?hl=enUsually for lower quality movies, it does not detect it
High quality ones especially Blueray rips or web-dl versions are almost always detected during uploading. (At least in my opinion)
There are ways to escape content id detection but it would need some added silence noise, cut content, or other ways to put off the detection which is not worth the time to do so for op.