They've actually been warning users since Catalina (if not longer) when the following are run:
python
irb
php --version
tclsh
For PHP, it also shows up in Apache's server string:
Apache/2.4.46 (Unix) PHP/7.3.24-(to be removed in future macOS) mod_perl/2.0.9 Perl/v5.30.2 on hostname
Personally, I've been hoping they'd do this for a while since it's annoying having two versions of each interpreter installed (the system one that can't be updated and the one I installed myself via Mac Ports). Anyone who uses these languages much probably already has a package manager installed. I think they should leave Perl, though, since it's as much as Unix system utility like awk or sed as a programming language.
python
irb
php --version
tclsh
For PHP, it also shows up in Apache's server string:
Apache/2.4.46 (Unix) PHP/7.3.24-(to be removed in future macOS) mod_perl/2.0.9 Perl/v5.30.2 on hostname
Personally, I've been hoping they'd do this for a while since it's annoying having two versions of each interpreter installed (the system one that can't be updated and the one I installed myself via Mac Ports). Anyone who uses these languages much probably already has a package manager installed. I think they should leave Perl, though, since it's as much as Unix system utility like awk or sed as a programming language.