If you received that email, completing KYC is still optional unless your account becomes restricted, requiring verification to continue playing. If you’re highly protective of your personal data, you can keep playing, but avoid going overboard on any casino—not just Stake. Winning big might trigger a mandatory KYC process regardless. Personally, I’d take the $250 offer now to avoid potential KYC hassles later. Ultimately, it’s up to you to decide what feels right.