Ya I guess not knowing the copywrite status of each midi file in the collection could be a problem as well as not having the contact info of each composer/artist and many of the midi's are compositions of commercial copyrighted music. I'm somewhat of a digital hoarder, so I often fail to look at those things. Despite all these issues, no one seems to care about this collection as no one has requested
archive.org to take it down and it is a fairly well known midi collection on the internet.
Here is a BBS CD called "DR. MUSIC, CDXPRT" by Aces Research, Inc., published in 1993, it is a Music software and Midi, CMF, ROL, MOD, WAV, VOC and SND collection CD for BBS's. I own a physical copy of this CD which I purchased in 1993 or 1994 at Radio Shack if I am remembering right. They have archived a digital copy of this CD which is downloadable from their website:
https://archive.org/details/drmusicI am not sure how they are able to legally distribute this CD as a digital download.