Fraud is a fraud, whether we're talking about fiat money, crypto, sugar, flour or anything else.
If someone cheats on me with a crypto, I also expect the person to be held criminally responsible for such a scam.
Why anything would be different?
Of course, in the case of crypto it is much more difficult to find the culprits but we see that it is not impossible.
There is no decentralisation for crime.
Persecution of fraud requires regulation and funding. I don't know the exact state of cryptocurrency legislation in Serbia, however, in case there are no regulations there won't be persecution of this type of criminals either. What many don't understand is that without the government having a stream of income from a certain industry, it won't be able to spend taxes from the rest of the society that doesn't use cryptocurrencies.
Earlier last year in Russia, a person was kidnapped and forced to hand over the private keys of his Bitcoin wallet to the culprits. Because Bitcoin had no legal entity in Russia, judges decided the Bitcoin theft wasn't going to be given a verdict. They only judged the criminals for the case of kidnapping. Do you see what happens when there are no regulations? The Russian government a few months later passed a law regulating Bitcoin as an asset, so the above court verdict could be challenged again by the victim at a higher court.
So, if someone cheats you in crypto and your country hasn't regulated and made clear that Bitcoin is an asset, and in case no other crime has been committed, it will only fall under some kind of law of telecommunications scam but it probably won't be given a lot of attention from your regional authorities.
It is not very hard to find the culprits of Bitcoin theft or scams either, only in rare occasions this is impossible.