Founders can talk to therapists who won't talk to anyone else about their troubles. It's not a perfect solution, but probably better than not talking to anyone.
Not to downplay the value of therapists, but the help that a therapist could provide is different then the help one might find from a peer/colleague in the same industry/situation. the problem is therapists are always available (well, for a price) but a peer that you can trust with the same sense of confidentiality is rare.