"blew up" can be positive or negative depending on context. Generally when talking about a physical object it's negative, when talking about a personal endeavor it's generally positive.
"My server blew up" is likely negative.
"My youtube channel blew up" is likely positive, it means it went viral.
If a business blew up, it's almost certainly positive.
"My server blew up" is likely negative.
"My youtube channel blew up" is likely positive, it means it went viral.
If a business blew up, it's almost certainly positive.