A term-sheet is a non-binding agreement. So I think it's pretty easy for investors to test the waters by throwing out a term-sheet, and then finding out if YC is investing or not. If not, they come up with a reason to pull the term sheet.
Anybody else think this is a possibility?
Of course, these investors may get a bad score in YCs internal systems, but are other YC companies not going to meet with the VC based on those feedback systems?
TBH, I didn't know YC had a guaranteed follow-on amount. Either way, you just gotta be too good to ignore.