still not forgetting about (((bankman)))
(media.scored.co)
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...those are literally centralized exchanges. They're just accessible from your wallet app, and sometimes aren't as big as the ones like Coinbase. You're still giving your card details to some centralized company who is processing your payment and sending crypto to your wallet. That is a centralized exchange. There is no inherent benefit to using the one that happens to be built into your wallet app versus one elsewhere and then sending the crypto to your wallet. Ironically, I'd actually trust a wallet app *slightly* less if it had this feature built in, as it means the app itself is communicating back to their servers unnecessarily.
>you're not supposed to keep your crypto in a hot wallet
"hot" and "cold" wallets are truly just buzzwords. And they're typically used by people who don't actually know what they're talking about. The underlying advice usually *happens* to be good advice to some extent, but dumbing it down using words like "hot wallet" and "cold wallet" ultimately does a disservice to everyone and often leads to a false sense of security or a waste of money.
Your take on the advice, specifically, is a waste of money in gas fees. Every transfer costs money and your suggestion to purchase the crypto into your wallet and then move it to another wallet is one more transfer than required, for exactly *zero* security risk.
To use your terms, all you have to do is get the public key of your "cold" wallet and enter it into Moonpay's website to receive your crypto directly into that wallet.
The reason the term "cold" wallet is bad is because it implies the wallet itself is offline. It's not. It's on the blockchain just as much as any "hot" wallet. The reason this often provides a false sense of security is because people think that as long as their "hardware wallet" is unplugged, their crypto can't be stolen... so they are careless with their private key or seed phrase. They don't realize that if their seed phrase is leaked... their money is gone even if their hardware wallet was never plugged in. The reason this often wastes money is because people think they're somehow safer doing an extra hop through a "hot" wallet, when it often makes no difference (such as in your example).