If you try to run x64 apps in cli without rosetta installed you will get:

(sekey is from github, x64 bin):

user@MacBook-Air ~ % file $(which sekey)
/Applications/SeKey.app/Contents/MacOS/sekey: Mach-O 64-bit executable x86_64

user@MacBook-Air ~ % arch -arch x86_64 $(which sekey)
arch: posix_spawnp: /Applications/SeKey.app/Contents/MacOS/sekey: Bad CPU type in executable

after install:

user@MacBook-Air ~ % arch -arch x86_64 $(which sekey)
user@MacBook-Air ~ %