You don't know your LTV, churn rate, or even if you have product market fit at the beginning so paid acquisition is sort a gamble. I think YC soundly advises th

You don't know your LTV, churn rate, or even if you have product market fit at the beginning so paid acquisition is sort a gamble. I think YC soundly advises that you get your initial customers in ways that are less scaleable and get to know them a bit before you turn on the firehose.