Maybe. It’s a common refrain from email spam that all of the misspellings and grammatical errors are intentional choices. There is no way to confirm or disprove it either way.
However, in the “unlikely” column, the spam industry works on a “SaaS” model where the people that send out millions of spam emails are paid to do so by customers. They compromise email severs and end user devices to build up a fleet of machines to send out the messages.
The spammers themselves don’t care if the customers content succeeds or not, so there is no incentive to help them write good spam. They just pull in the next sucker who thinks sending out 10 million badly worded emails will work to make them money.