The BalenaEtcher Appimage is 89 MB
The debian package is 82 MB
And etcher-bin-1.5.122-1-x86_64.pkg.tar.zst is also only 89 MB.
etcher is an electron app and electron apps tend to be a little bigger than other apps.
I used etcher last week several times and it works just fine. I like the user interface 