Every blockchain and cryptocurrency ecosystem will go through its own set of growing pains. That is par for the course, as no technology works perfectly out of the box. In the case of EOS, its gambling dApps have proven to be extremely popular. Unfortunately, it seems at least three of them have been hacked recently by exploiting EOS nodes.
It is not uncommon for criminals to look for weaknesses in altcoins or even Bitcoin. Any potential flaw or weakness will be exploited sooner or later. How successful this venture ends up being, will usually vary quite a bit. In the case of the EOS gambling dApps getting attacked, the total damage seemingly adds up to 200,000 EOS being stolen without recourse.