That's true. In majority of the cases, it has been the user negligence and sometimes trying of their luck if possible to extort the casino. As someone said above, you can only threaten to ruin the reputation of the casino when the casino is obviously at wrong and their intention is to defraud.
Many users of this forum are smart and in most cases they don't see cases from the angle of emotions but facts. So, to be able to ruin an honest casino, you have to provide 100% evidences all the time for a fewer time.
I however believe that most fake accusations are from individuals trying to profit where they did not sow rather than from competitors.
I doubt it is even possible to attempt such act by someone randomly, they should be having many followers on their socials but what we see here are users unintentionally bypassed the restrictions or used multiple accounts and claimed bonuses or created new account whole they self excluded themselves and anything that can be considered as serious abuses will mostly end up losing the account along with the balance left in it but also in certain cases only the deposits will be returned.