Buying crypto with a bank card and no KYC is about the on-ramp. Spending crypto through a no-KYC card is about the card itself. These are two different steps, and each can expose different parts of your money trail.
You might buy USDT through a service with lighter checks, send it to one of the best DeFi wallet, and then top up SolCard for online spending. In that case, the card step may stay lighter, but the transfer path can still be traced onchain from the funding wallet to the card top-up.
A second example looks very different. You might buy crypto on a fully verified exchange, move it to Bing Card, and spend without extra card checks at first. The card may still count as no-KYC at entry, but the privacy angle is already weaker because the exchange linked the funds to your identity before the card was used.
That is why some users need more than one tool: a place to buy with lighter checks, a self-custody wallet, and a card that does not ask for full verification on day one. If you are still mapping that path, it also helps to look at instant swap exchanges and anon crypto wallets.
The card only covers the last spending step. Privacy can still weaken earlier through the on-ramp, later through blockchain trails, or after a problem like a refund, chargeback, or support review.