an example for what is coming is Bitstamp. Bitstamp for the most active account ask to prove where you get or buy those bitcoins that you trade there.
This is not a simple KYC but a heavy barrier to use this exchange especially for ppl that holds a great ammount  of bitcoin and they get them from differnt sources.

I believe that Bitcoin and general crypto indrustry enter an era of heavy regulations.

Regulations that will do near impossible for the most ppl to buy, trade or even use Bitcoin.

Today EFF have post an article about this matter

https://thedefiant.io/crypto-endangered-confronting-an-existential-threat/

https://twitter.com/EFF/status/1448023101518671873

Bitsamp already do this and ask from the most of their customers to give them every bitcoin or crypto transaction they have done the last years. Where they buy and where they get them.

Maybe this new heavy regulator era will be and a great opportunity for a growth to p2p exchanges.

Συμφωνία του Cade Cunningham για πληρωμή του Bonus σε Bitcoin
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https://www.bitcoin-gr.org/cade-cunningham-get-his-bonus-to-bitcoin/