The faxes still come through serially with the receiving machine able to set the maximum rate of transmission. With one phone line and four minutes per fax that's a maximum of 360 requests per day. Send some long outgoing faxes and availability for receiving notices goes down.

In any event, spooling up a lot of faxes would tie up YC's fax machine, not YC's staff.

Couldn't you just use some online faxing service? That would prevent the 360 request/day limit you mentioned. I don't think any place sending mass DMCA take downs would be sending faxes themselves.

I believe his point was that the bottleneck was on the receiving side, not the sending side.

If it was from the one party, then that could be reasonably seen as trying to disrupt their service.

I'm sure that's when the machine would become unplugged and the fax option stricken from the record.