In theoretical computer science, at least, researchers plan their work to finish on three major deadlines a year (SODA, STOC, FOCS). STOC [1] is requiring all submissions to be uploaded to ArXiv before submission, and allows up to 5 submissions per author. I wonder if they'll change their policy or instead adopt an additional de-facto limit of two per submitter.
[1] STOC 2027 Call for Papers https://acm-stoc.org/stoc2027/stoc2027-cfp.html