It might be different in other places but here, in a large city of continental Europe, Telegram is definitely little more than an enabler for illegal activities.
That said, you CAN buy drugs on Telegram, sure, it is just not as easy as everyone seems to think. You need to know the account name of a service that delivers in your area, you need to be reeealy careful when typing the account name because for every real drug seller account there are multiple fakes with slight variation in the name that fish for people using search, and then even if you have a verified account and they sold you drugs last month, there is like 30% chance that the account have been compromised and now you are talking with scammers again.
She first asked where I was and was very coincidentally there as well. A sure sign of a scam.
Then asked me to buy a steam card and take a photo of the code before "meeting".
The victim of drugs is the whole society. It's only "victimless" in an absolutely individualistic environment, which I wouldn't even call a "society".
But none of this contradicts my initial comment. Telegram is a straight enabler of illegal activities.