Many publishers will ask for a full transfer of copyright as part of a publication agreement for a journal, book chapter, book, or other scholarly work. However, a complete transfer of rights may hinder the author's future use of their own work, even in their teaching and research.
Publishing contracts may prevent an author from posting a manuscript or published work on their own website or an institutional repository, including sections of their own published works in future scholarly works, or making other non-commercial use of their own scholarship.
However, there are options: transferring copyright is not necessarily all-or-nothing! A publication agreement may be negotiated or amended, or an author may request to include an addendum to retain certain rights.
See: Elliott Hibbler (2024): Copyright and Scholarship: Author Rights.
See: Jennifer Schaefer (2024): Negotiating Author-Friendly Publication Agreements — Negotiating with Publishers.