Flash memory has a finite number of write cycles. This is a real issue with dash and security cameras, where new footage continuously overwrites the oldest. High Endurance SD cards cost more, but are recommended for dashcams as they're designed to handle more write cycles.

My son put a cheap SD card in his dashcam and wore it out in about a year. You don't want to try downloading important video to your PC, only to discover that parts of it are corrupted!