Have you seen the link to 50% off Binance Fees?
If you have signed up through these ads, you may not receive any commission discounts at all. In a nutshell, Binance Exchange does not offer a 50% discount link to investors. The maximum discount rate is 20% for spot trading and 10% for futures trading.

Read this article to avoid getting scammed!
How to Check Binance Fee Discount?
In order to properly apply the Binance Fee Discount, you need to know and confirm the following:
Be sure to check your Binance address first. Binance address is binance.com and when you sign up for Binance your address is accounts.binance.com.

※ Make sure your address is correct!
Depending on your nationality, you may not be able to use Binance Exchange. Some countries have IP-blocked on Binance sites. That’s why you can’t use Binance unless it’s a VPN bypass. In the US, there is a separate Binance US, so please sign up separately.
https://accounts.binance.com/en/register?ref=RJKYHK2D
Please click the link above and try to sign up by phone or email.

You can see that you can get a 20% discount as below.

The 20% commission discount link provided by Binance is genuine and max. If you see 50% or 40%, be sure to stop signing up.
If you sign up using the link above, a 20% discount is applied without any problem, so you can use it.