Recently I received this comment from an Elsevier editor "The manuscript does not reach the required quality standard of this journal.". Since then have been found some answers but also raise additional questions. Like the one I making here. (You can browse the initial question following this link here.)
One of the criteria for acceptance of a paper is the one of written language throughout the text. Many times is found great published articles on more peripherical journals simply because the article does not comply strictly with the language minimum requirements for any other more reputable* Journals. Spite all the work is properly done, explained, and demonstrated both graphically and mathematically.
In my particular case, my written English inherits some of my native language (PT) sentence constructs, which may be confusing to those with native English (UK and US) writing skills.
That said, and thinking also in terms of open-data and open-source access to all, how can a researcher, in particular a junior (newbie) research, can learn the language requirements for a specific scientific Journal?
EDIT: Yesterday I forgot to add an essential and relevant fact to this conversion, which is: many and many scientific researchers don't have the opportunity to develop their research works in a team or even do it collaboratively. They have to rely on themselves to present their findings and defend their thesis. And everyone here is acquainted with the syndrome of "tunnel effect" when writing. So having someone, that can give a small contribution to unlocking someone else research writing, I see as a welcoming behavior that can only benefit the scientific community at the individual level.
EDIT 2: in the midst of all these comments and answers, I found today, this small tutorial with some useful tips for non-native English researchers https://www.emeraldgrouppublishing.com/how-to/authoring-editing-reviewing/submit-for-non-native-english-speakers
EDIT 3: since the initial commit, I took the liberty and went requesting quotes online for proofreading and grammar. 400 CAD is quite a lot for a student, imho. It's not feasible.