Our friends at Redsift wrote a very pertinent article reporting on new delivery restrictions that will be imposed starting in February 2024 which will require senders to implement DMARC (amoungst other measures) to insure deliverability to their domains.
https://blog.redsift.com/email/google-and-yahoo-announce-new-requirements-for-email-delivery/
This makes it even more pertinent in 2024 to implement proper DMARC policies if you send a large volume of Emails to Google and/or Yahoo. Chances are the other big "free" email providers will follow the same pattern.