look at the bigger picture not just a color on a number on a list then you understand if it is really a good high risk to invest in these coins or a dumb high risk.

i suggest looking at their charts instead, the charts tell you a lot of things. for example you can easily see a dead, no action, no volume, no price rise for years and a sudden rise in past month (hence the green number there). and that means it was a one time thing and won't happen again for a long time.