> That's the definition of insurance.
The GP was talking about the marketing (cash back / rebates, discount rates, travel insurance) aspects of credit cards. These aren't insurance in any meaningful way. They are marketing expenditures designed to persuade credit card end-users to stay with a credit card brand. It's not unlike the Apple / Google / Amazon walled gardens for their {devices, paid apps, paid downloads, DRMed content}.
It's not "insurance". Banks and credit cards are regulated by government, so their offerings must meet the standards of the regulations. If cryptocurrencies become widely used for purchases, they, too, will likely become subject to tighter regulation. Additionally, contracts with other parties (cryptocurrency exchangers, retailers, etc) will need to ensure a certain amount of "insurance" of some sort in order to gain wider market acceptance.
The reason you don't get "cash back" from cryptocurrency (or cash) transactions is because there is no (hidden from the end user) 2.5%+ (sometimes 4%+) transaction fee paid by the merchant. That means the merchant passes on that cost onto the end user in the form of higher prices. Their merchant contracts with the credit card systems restrict how they can message this to the end user, so it's an opaque cost. When the Bitcoin protocol change dust settles, Bitcoin transactions will again be far lower than comparable credit card transaction fees.
The only reasonable aspect of credit card purchases that could be considered some form of "insurance" are the protections granted by state governments in the form of consumer protections for retailer purchases (in the form of returns, warranties, etc). Presumably these exist in the same form whether you purchase via cash, plastic, or cryptocurrency. The trick is that these protections are limited if you purchase anything outside of your state (like international transactions).