Why are Chinese players spamming numbers in chat?

[Ransurias 36]

Here's a screenshot for reference. Why are they doing this? What purpose does it serve to spam "1" or "123" into global chat?

 

[Orv Williams 7]

What you are seeing is people using the Chinese character set to type with Chinese keyboards.
You do not see the Chinese characters because your PC does not have them installed, so you are seeing a placeholder.

 

[Talono 434]

They are typing their worker bee identification number, „Chinese farming bot No. 495434“ and so on