> Bribery refers to the offering, giving, soliciting, or receiving of any item of value as a means of influencing the actions of an individual holding a public or legal duty.
Scientific journals are not public institutions (though maybe they should be) so their editors aren't holding public duty. Legal duty also seems a stretch, though maybe possible depending on how the editor's contracts are worded. I suspect they don't say very much detail on job responsibilities though.
So immoral, and stuff many companies and institutions consequently have policies against, but doesn't seem illegal.