the reason I did KYC earlier was because I registered on several trusted casino sites in this forum for the long term and wanted me to gamble comfortably and safely without worrying that one day I would have to ask for KYC again to win big.
maybe some people disagree with my statement, but that's what i do honestly. because we really don't know anything that will happen tomorrow in gambling and about big wins.
You have your own preferences which is fine, but saying that later KYC will be more complicated is not completely true. As long as we are playing in reputable casinos, later KYC will be the same as early KYC because the process is basically the same. We should not be worried about later KYC in a case when we make a huge win, as long as we did not do something against the ToS and/or TnC of the casinos, there will be no problem of doing later KYC.
I'm wondering where the complicated things later on to happen on his statement since this will only applicable if you do KYC on not reputable casino. Instead you became better for the security of the account attached by the KYC submitted you will be in risky condition since the possible scammers handle your identity. We also need to look at the brighter side of providing KYC since this mean that long time running casino is law compliance one or even protecting the account their users.