Newspaper Spellchucker

I finally worked out what the problem is with the errant spelling in online newspaper articles.
1 I initially thought the articles were written by foreigners with poor English working for low or no pay.
2 Then I thought the writers must be people using dictating machines or mobile phones which turn the spoken world into text.
3 Now I think that after the journalist or secretary has typed up the article correctly, an automatic spellchecker or predictive text is changing words to the more frequent use of a word starting with the same letters.
4 Can somebody on the staff or in the business tell us the truth.