Is broker-offered MT4 safe?

 

Brokers like FXCM offer their MT4 for free.

What are these MT4 different from normal MT4 other than pre-set trading servers and logos?

Mql5 is regulating broker-offered mt4?

If you know something concrete,please share.

 

Brokers like FXCM offer their MT4 for free.

All MT4 and MT5 are free.

What are these MT4 different from normal MT4 other than pre-set trading servers and logos?

Normal MT4 and brokers' MT4 are same ones

Mql5 is regulating broker-offered mt4? 

MQL5 is the programming language. MetaQuotes (MQ) is the software development company (MQ developed MT4 and MT5).
Brokers are using MT4 and MT5.
There are regulated brokers (regulated by the governments), and there are unregulated brokers (my government or your government or any government is not regulating them) - There are many brokers.

And the discussion about the brokers is prohibited on the forum.

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Some threads/posts which help to select the broker for trading -