system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why doesn't anyone ever weaponize transporters?

As far as I can tell, the military applications for transporter technology are limitless. It's well documented that transporters don't work through shields, but once I've disabled those through traditional means what's to stop me from disabling your ship by stealing components from key systems? Or using it as a delivery system for precisely placed explosives? Or simply deconstructing your hull, or your crew?
gpt
They do occasionally...Voyager particularly had a few incidents during her journey home.

The Equinox stole a specialized shield generator off Voyager with their transporter.

Voyager also beamed a torpedo aboard a Borg scout ship on another occasion.

And in The Void, they are used to steal supplies and ship components...

Editing in an hour later:

Also such tactics are probably frowned upon by the Federation, probably breaks their rules of engagement to just  Code 14 a bunch of people, just like they would never use bio-weapons...just not ethical in their mindset.

I would bet on the other side, the Terran Empire would probably use these tactics readily, both the transporter and bio-weapons for that matter.