But publishing a paper is generally to spread your knowledge (improve your reputation). In this regard, it is difficult to get the publishing house to give you free.

Secondly, the editorial board of peer review is generally at the professor level, and people themselves are very busy, so it is impossible to make time for you to do free work.

Secondly, periodical publishing houses also have operating costs, so it is impossible to give you free works.

Time and time again, the paper publishing industry has done a good job of charging fees, but the fees collected have not reached the journals.

Finally, the world's paper publishing industry is basically charged, accounting for almost 90% of this industry. An article about nature costs 3000 dollars.

Paper publishing and document publishing are different.