How does Apple's mobile phone information hack each other?

Apple's mobile phone information hacked the other party as follows:

Device model: iPhone7

System version: ios 13

Software version: WeChat version 8.0.6

1, open the message first, as shown in the figure:

2. Then click the contact photo you want to blacken, as shown in the figure:

3. Enter the contact information interface and click the symbol under the contact photo, as shown:

4. Then jump to the details and click the contact name, as shown below:

5. Then click to block this calling number, as shown in figure:

6. Finally, click the block contact, and you can hack the other party's short message.