They have different tier system IIRC so people can avail 10K limit per annum by verifying their address and photo ID which is decent for someone who convert occasionally. And when our country doesn't really support cryptos or high taxes for crypto conversion then choosing the DEX is best even though the price offers are lesser.
I think it depends on where you come from but seriously their additional questions for KYC are so strict and pointless. When I check it out on my account, It's Like an interrogation. On top of uploading your documents, they want to know about;
- Your source of Income
- How much you earn annually
- Occupation
- Source of your bitcoins and proof of the source etc
I have a verified account on Binance for p2p trading, they have never required me to fill out such useless questions.