Can I keep selling and buying btc by using paxful without kyc via changing
email and cellphone number constantly?
There are many platform out there that are much better than paxful dude, don't risk your capital with kind of platform.
For me in my opinion it's not a good one to buy Bitcoin, why don't you try to use platform in buying bitcoin that are more
listed on top in the market like Binance, Kucoin, Houbi or Okex and more.
His main problem I think is about him giving up his personal data as a KYC requirement which is really a sad thing because we all know even those exchanges you mention are now strict with KYC. His problem is easy to be solve really and that's accepting the fact that if you are involve in trading you must accept that KYC will always be a part of it due to AML laws in place. A lot of people including the OP still thinks that anonymity is an option but it is slowly fading away and maybe soon enough KYC might be a requirement even before you can open an account for crypto trading.