In https://outage.ant.isi.edu, one should look at the circle colors, not just sizes. Circle colors indicate the fraction of networks (technically: /24 IPv4 newtork prefixes) that are down, and in Bangladesh, the hard red means nearly 100% are unreachable.
While Europe has many circles and therefore some networks are down, because they are blue that means it's only a few that are unreachable. Europe has many, many networks.
