7 years of building what exactly?
I didn't see anything made by them that contributed Bitcoin code in any way, instead they spent a bunch of time creating parallel centralized ecosystem with binance chain.
Another result after 7 years of existance is that CZ their CEO end up locked in prison 
I think they contributed a lot to the ecossystem.
Binance is a very high quality and secure cryptocurrency exchange. They did what they could to protect users privacy for many years. Until 2021, you could withdrawal about 2 BTC per day without any KYC.
Before binance coming to Brazil, buying bitcoin here was a terrible experience.
Local Exchanges had a very low quality and very expensive.
If you send some money to buy bitcoin and then withdrawal to your wallet, you would instantly lose 10% in fees. Bitcoin was also 10% more expensive in Brazil.
I had waited for more than a week to see a deposit of about 5k USD being credited to my account in a local exchange.
Binance changed everything here. I would say bitcoin changed crypto ecosystem offering high quality services for very low fees.