Why can't you buy crypto with a credit card?

Why is it that individuals often encounter difficulties when attempting to purchase cryptocurrency using a credit card? The process seems straightforward, yet many platforms and exchanges restrict or outright prohibit this payment method. Could it be due to the volatile nature of cryptocurrencies, where their value can fluctuate significantly? Is it a security concern, as credit card fraud and identity theft are always a risk? Or perhaps it's a matter of regulation, where banks and financial institutions are hesitant to facilitate transactions involving unregulated assets? Understanding the reasons behind this limitation could help potential investors navigate the crypto market more effectively.