One can opt out from it later right?
Indeed.
is the eazyshop platinum dc better than millenia dc in any aspects except lounge access?
Never used eazyshop platinum dc. So, no idea what benefits it provides. I actually opened HDFC SB account less than a year ago mainly for pre-approved CC, without knowing any of the benefits of DC. So, I am actually kind of new to HDFC eco-system. Still learning.