1) would've other crypto's survived during that time ?.
Many survived but many more eventually disappeared and all the cryptos that could not survive during the crypto winter were those that had no purpose of use and were also made only to get a lot of money from investors and left the development of the project just like that because they realized that it's not easy to make a coin that can become big and get a lot of attention from crypto lovers
2) Why do Bitcoin survive during crypto winter and other crypto's finds it difficult to cope ?.
The reason is always the same because Bitcoin has good fundamentals, the initial reason for its creation is clear so that this clarity makes many crypto lovers support the development they need every time, which is very inversely proportional to other coins