What's wrong with adding someone else's qq without texting?

This is because the other party has set to allow anyone to add himself as a friend, so there is no need to send a verification message. The method of setting to allow anyone to add himself as a friend is as follows:

1. Log in to your qq and click the settings icon, as shown.

2. Click the permission settings at the top, then click the anti-harassment on the left, and then click Allow anyone in the authentication mode on the right.