It is dangerous. The DNA companies sell your information. This isn't a major issue today but it will be as biometric technology becomes more common. I don't recommend it if you already know you're full Somali.
You cannot hide from ''bioweapon makers'' because they will have access to publicly available genomes from academic studies. Like this study and many others. Most of your personal variation will be already captured by this.
This bioweapon stuff is extreme paranoia as Somalis are at the bottom on the list for elimination. If a bioweapon is even created (not possible and zero evidence one ever was created) they will go for the Han Chinese, the Russians or other more powerful and influential groups.
Lastly, populations who are tested well can benefit from advanced personalized medicine and better healthcare treatments while your unstudied group will be stuck with primitive healthcare methods.