Now, if you can earn in coins, and live and pay on coins, then you can probably skip the bank completely, and it's quite possible to skip KYC that way, but difficult. If you have an employer that pays you in coins, they already know you and have your KYC info.
I met several enthusiasts on YouTube who conducted experiments in the "life without fiat" style ... but this is more entertainment ... unfortunately, a full life is not possible if you use only cryptocurrency.