Because these servers are not optimized for mass public streaming, they offer highly unstable bandwidth. Multiple users attempting to download multi-gigabyte video files simultaneously will cause server crashes or painfully slow download speeds. 3. Dead Links and Incompleteness
Thousands of pre-1928 films and some later works are in the public domain. Check: parent directory index hollywood movies
If you want to automate file discovery, I can teach you how to write custom to download entire directories at once. Because these servers are not optimized for mass