how does a scam broker look?

In my opinion, a scam locker will complicate the withdrawal process that we do, even though we are trading not violating the rules, it will freeze our account when the profit is large enough for no reason,

Indeed, many scam brokers use a manipulative system called a locker or profit trap. Even honest traders can be sacrificed because scam brokers do not operate based on fairness. Do not let large funds enter before it is proven that they can WD smoothly.

I guess we can also diversify our funds to different reputed brokers rather than depositing large sum of money to one single and then struggling to get these funds back.

Distributing funds to a number of brokers is indeed good, but in my opinion it would be better if we first find out the reputation of the broker, even if we only deposit $100 with one broker but we cannot withdraw funds, in my opinion that is something we need to avoid.

Scam brokers are definitely not going to pay us a dime.
Therefore, it is better to anticipate by choosing a broker that has been proven to be good, don't just try a broker whose quality is unknown to us, don't be provoked by bonuses that can cheat, let alone a large deposit.

Agree, the main sign of a fraudulent broker is usually not paying out at all, especially when the funds start to become large. Therefore, precautionary measures are crucial: choose a broker with a proven reputation, clear regulation, and a history of smooth withdrawals from numerous users. Overly attractive bonuses are also often a lure, so don't be tempted without understanding the terms and conditions. It's better to use a broker with proven quality than to risk it on a platform with uncertain credibility.