This is a proposal by people funded by companies that would provide the services for this (https://balkaninsight.com/2023/09/25/who-benefits-inside-the-eus-fight-over-scanning-for-child-sex-content ).
A lot of actual politicians oppose this https://tbbacherle.eu/2024/06/18/open-letter/
There were talks a few years ago about changing sd-tmpfiles name but it was decide not worth it due to the churn and bikeshedding it would cause.
sd-tmpfiles is generally used to create, modify (e.g. permissions) and remove directories on the system. The home.conf is intended for systems that only ship /usr/ (e.g. containers) to create /home/ and /srv/ as a separate subvolume on btrfs