Perhaps they are reminded of the saying "a fool and his money are soon venture capital" I think only a very few numbers of YC companies have reached the stage

Perhaps they are reminded of the saying "a fool and his money are soon venture capital" I think only a very few numbers of YC companies have reached the stage where they coud responsibly choose to risk some cash on an investment. Most liley the ones that have done it have not made a big deal about it, and the others are still trying to figure it out. In the end though, I would suggest you do not adopt the idea that these other companies have any requirement or responsibility to pay it forward.