according to my opinion it is not. Not only because of ethical issues but at the same time some "predatory" or "fake" publication companies are trying to get money from researchers all over the world and it is not that easy to discriminate a fake (hijacked) journal from it is original. Bealls list helps a little bit for that (http://beallslist.weebly.com/hijacked-journals.html)If you'll submit a paper to an open access journal, DOAJ (https://doaj.org/) web page can help.