That's a dificult one to answer without seeing some samples of deleted posts. You need to look through the rules, and you should be able to get an ideas of the reasons - for example - off topic, incorrect information, self-moderated thread, etc,

One example of incorrect information is this post of yours

Due to the traceability of Bitcoin transactions, criminal use has reduced recently, and fiat banking, cash, gold and other methods are more common in association with illegal activities.