I'll translate this question into English, focusing on key signs like unrealistic rewards and pressure tactics to help you identify illegal airdrop projects.

When participating in airdrops, it's crucial to spot illegal projects. In terms of the project mode, beware if it guarantees high - return rewards with no clear business model, as legitimate airdrops are usually part of a project's promotion for its development. Regarding the promotion, projects that use high - pressure sales tactics, such as urging you to act immediately without giving you time to think, are likely illegal. Also, if the information is too good to be true, like promising huge profits with no risk, it's a red flag. Avoid such projects to protect yourself from potential scams.