One-click group joining on the WeChat applet is not real and safe. The following are some security risks associated with one-click group joining.

1. Fake groups: Some criminals may create fake WeChat groups to lure users to click the one-click group button to achieve fraud or other illegal purposes.

2. Personal privacy leakage: Some WeChat groups may require users to provide sensitive personal information, such as mobile phone numbers, ID numbers, etc., which may lead to leakage of users' personal privacy.

3. Virus attack: Some malicious programs may disguise themselves as WeChat applets and lure users to click the one-click group button, thereby spreading virus programs to the user's device.