In this era of the cryptocurrency world, there are lots of project on the market today and we cannot deny the fact that some of them are failing and there are many factors to consider on why is it happening in a project.
1. They have unrealistic whitepaper/ offers, wherein their only goal is to take our money and run away (sometimes a scammer)
2. Not dedicated dev team in order to provide a good service to its client.
3. Lack of positive feedback/support from the community.
4. Poor quality of projects and ended up getting bankruptcy due to misusage of finances.

You have to pick the best project out there, and always do some research before investing in it to avoid a huge loss in the market.