Are you talking about brokers or bookies? Many forum members obviously think that you are talking about bookies, but I assume that you are talking about brokers.
This topic belongs to the Gambling Discussion forum(or maybe the Trading Discussion forum).
The brokers, who are doing such shady practices are breaking the law. They must be prosecuted and sentenced guilty.
Nobody is forcing you to use the services of a financial broker. Trading on the financial markets has become more accessible than ever.
Why would anyone want to use a broker nowadays? Some people are falling for various "trading broker" scams, where the brokers are offering "high and guaranteed profits". Those scams have nothing to do with the legal and whitehat financial brokerage.