Your writing is great, congratulations! Just take a look at the things I highlighted in order to make it even better:
"The international black market of guns is the most profitable business around the planet, and it's easy to know the reason for that. Due to
the incessant conflicts around the world,
the black market is always blowing up. Internet is an
important factor for
this market as well
: you just need to open Google and do a fast search to see websites selling guns and illegal weapons (illegal in Brazil of course)."
1) Take a look at the difference between due
and due to
on this Thesaurus:
Due to: http://www.thesaurus.com/browse/due%20to?s=t
2) It's not necessary to use the definite article "the" before the nouns "internet" and "Google" when they are the subject of the sentence. Same thing happens with some nouns like "people", "religion", "lunch", "medicine", names of countries, etc. We have a great article about this, btw: https://www.englishexperts.com.br/artigos-em-ingles/
3) We don't usually use as well
at the beginning of a clause. It usually comes at the end of a clause: "I just ignored it. I think everybody else did as well."
Have fun and keep up the good work!