Step 1 - have some very basic thing that provides some essential value, Step 2 - scale quickly and dominate the market, Step 3 - settle into viability.
Capital deployed effectively is effective that it can be distracting is one of the risks. Also, in growth phase, usually growth and getting to mass-market is more important than sustainability. If you're the new Twitter, you want to get to 500M users or whatever as quickly as you can.
I feel like it's more important for step 3 to come before step 2 now, although I understand this will not be possible for some business models. But that being said, in most of such cases it's actually questionable whether these business models should exist in the first place and are a good use of capital since so few of them workout
Capital deployed effectively is effective that it can be distracting is one of the risks. Also, in growth phase, usually growth and getting to mass-market is more important than sustainability. If you're the new Twitter, you want to get to 500M users or whatever as quickly as you can.