Sadly, it happens more often than you would think. I would suggest keeping your hopes up for other companies that you can apply to, taking whatever learnings you can from this process, and move on.
Definitely ask for feedback from the previous company. Most companies provide feedback as to what went wrong.
Yup. That was my inspiration, and sadly, I have been on the side as well where things started from scratch, and ended up blowing up couple of months later.
While I agree to certain extent, you still have these things in different shapes and sizes. Startup teams are a tight knit community in my experience, but as it scales, these aspects start to show their heads.
1.https://docs.google.com/spreadsheets/d/10j_wA27aiRoOMP3DL9Tq...
2. https://littleblah.com/post/patterns_and_habits/