Why are there always many typos on spam messages?

Spam messages, everyone has received them, and they have been sent.

Many times I can't help laughing when I receive spam messages. Liars don't read books? The level is so low? It's all typos!

More often, I have some doubts. Is it really just a low level?

It took a hundred degrees to find out for a reason. Because the mobile phone security system will automatically intercept some short messages with sensitive words, such as gambling, security, loans, etc. will be automatically blocked.

Therefore, companies that send short messages in groups have come up with such a way to deliberately type two typos to avoid being intercepted by the system.

Oh, never think too smart about yourself and too stupid about others.