Many say here that Bitcoin can indeed be tracked for transactions, but it's better if there is a more sophisticated system to find people who commit fraud or take our Bitcoin secretly, for example, their data can be seen or their faces recorded with sensors that are has been prepared with a tool that has been designed. That's just my imagination.

It can be but for now it's not worth it. Teams that do it like for the FBI are spending a lot of time and human resources to track people and they're interested in big fish like that guy owner of BTC-e that was laundering money. So if you're a big scammer who took millions you have reasons to worry but then you can probably run to a country with no extradition

It's called KYC and there's no way we could get that kind of information or data if they didn't submit it themselves but most of the scammers know well that doing so will only expose their identites so they choose not to do that. However, if the whole crypto enable a further tracing then we will lost our freedom aswell and it's not really decentralized. The transparent transaction is enough.