You are at liberty to believe what pleases you the most. If you're interested in finding the truth, you'll have to first understand that drug markets are underground, which means you will not find any verified accounting. The UN estimated [1] in 2020 the size of the darknet drug trade to about $315 million per year or at most $725 million per year - which is nothing compared to the overall drug trade, but disruptive for certain categories of drugs that are easily sent by mail.
People are buying drugs on the darknet, who would never buy it on the streets or want to be associated with regular drug users.
[1] https://www.unodc.org/res/wdr2021/field/WDR21_Booklet_2.pdf
