The site isn't online as you all have pointed out.
Is this something just normal with diggit or should people be worried about their investments?
This isn't uncommon for diggit, it's had its share of server issues as of late. But I highly doubt that there is any reason to worry about investment, it'll be back in due time

I just wonder that why do people invest their bitcoin in a site which constantly goes down because of server issues. Such a site should struggle even to attract customers and thus will struggle to create profits. So idk why people invest when they will get lesser returns and a bad site.
Meh, it's not a bad site by any means. The profits and returns are still fairly good, considering how new this site is. It's got a lot to it that other gambling sites don't have, and I understand why people like it so much. But at the same time, I see your point. Let's just hope this gets sorted out soon