Do you think that "paid journals" (I think you mean a journal with processing charges) are identical with "predatory journals" and should be banned? However, this is not true, see https://www.researchgate.net/post/Is-it-quite-the-same-a-predatory-journal-and-a-journal-that-charges-for-publishing .

See also the following discussions about publication costs:

https://www.researchgate.net/post/What_is_article_processing_charge_and_why_the_publication_fee_is_charged_to_Author

https://www.researchgate.net/post/Article_Processing_Charge

https://www.researchgate.net/post/A_research_paper_costs_more_to_publish_than_a_Car

https://www.researchgate.net/post/Publishing_open_access_for_1000

https://www.researchgate.net/post/What_is_the_difference_between_Pay_and_Publish_versus_Free_Publication_in_terms_of_publishing

https://www.researchgate.net/post/What_is_the_ACTUAL_COST_OF_A_PUBLICATION

https://www.researchgate.net/post/Is_it_true_that_only_open_access_journals_charge_publication_fee_while_subscription_journals_do_not_charge

https://www.researchgate.net/post/What_is_the_impact_of_high_article_processing_charges_on_research_publication_activities_in_low_and_middle_income_countries

https://www.researchgate.net/post/How-much-does-someone-pay-to-publish-in-this-journal

https://www.researchgate.net/post/Why_does_Nature_Open_Access_charge_so_much_to_publish

https://www.researchgate.net/post/What_is_your_opinion_on_the_journals_where_you_pay_a_fee_to_be_able_to_publish_your_paper

It depends on the field of study. But as an academic in the social sciences, it would not occur to me to pay in advance to have my work published.

Dear colleagues, thank you very much for your answer !

I do not see any logical reasoning behind this idea. If your reason is removing paid journals from these lists (as guessed by Dick), assuming they are prone to be predatory, it is not strong enough at all. Open Access (OA) is a publication model that provides answers to the problems that faced by readers in the subscription-based model. However, unfortunately, this OA model has been misused by the fake publishers and vendors at present. That's why we used to look into OA journals with a doubt. There any many reputed, genuine OA publishers/publications. The only thing we need is the skill to filter them out from others, but not to have a negative view on all OA publications. In case of indexing or abstracting, these services (particularly the services with human indexing) include criteria to exclude fake publications. In fact, inclusion of a few cases has been reported even in the reputed services, but not very often.

Dear Manjula, thank you very much for your answer.

Merci pour cette reponse