As a general guideline, using a demo account for at least a few weeks can give traders a reasonable idea of a broker's quality. However, it's essential to remember that a demo account may not fully replicate the experience of live trading, as there can be differences in order execution, slippage, and liquidity between the two environments.
When anything is described as "subject to change," there is a potential that you may incur more losses in terms of money, time, and effort.
Your brokerage company may execute trades with a different model than what they are supposed to.
The platform changes. You are used to using MT4. All of sudden, you have no choice but to move to MT5.
The stop-out level is increased. A higher stop-out level will cause you greater loss as it will let your losing position run its course until you have nothing left in the account.
Changes in spread and/or commission. Anything related to trading costs should be a sensitive matter as it influences one's profitability in the long run.
Leverages are lowered for no reason. This limitation may result in higher margin requirements and thus inflict on any trader who are used to trade with high leverage.
Your pair leaves you.
Obvious stop hunts. This often happens in market maker brokers who trade against the traders. In this case, you will find your stop losses getting executed just before the price moves in your favor.
Affiliates can play a crucial role in growing a brokerage business by promoting the broker's services to a wider audience. To incentivize affiliates, brokerages offer proper commissions and provide them with the tools and resources to market the services effectively.