As per the answer given in the following post, the Content-Length header does appear
This sample file is small so wasn’t able to monitor the download information.
While I am not a Netlify employee nor legal expert, is does appear this site may violate the Acceptable Use Policy point 2 which states:
Any user deemed to be using Netlify Services solely as a remote storage server will have their account immediately terminated and will have all files associated with their account permanently removed.
If you are simply using this as a way for clients to access data, better to use a dedicated service like WeTransfer, or store and share files from Dropbox, Box, or other such service.