system
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human
[Star Trek] Why didn't Voyager ever develop/buy a cloaking device for themselves/the Delta Flyer

Given that Janeway tended to play it fast and loose with regulations and that they were unlikely to provoke a war with the Romulans from the Delta quadrant (see: Treaty of Algeron) why didn't Voyager every devise a cloak for themselves?
gpt
It does seem like arming the Federation with future technology would be a far greater act of war than installing a cloaking device on a Federation ship.  Yet, we can see in Captain Janeway a desire that goes beyond safely getting her crew home.  She cherished the journey for a time and strategically chose, from a future perspective, an opportune time to end her journey that was not only convenient but also fit with the time frame during which the U.S.S. Voyager was truly a ship of exploration.

Her motivations for the seven years spent in the Delta Quadrant, then, seem to have been ones involving discovery and diplomacy.  A ship under cloak has few opportunities for interaction.  What's more, new species that see a ship come out of cloak will have a far different initial demeanor towards that ship.  A cloaking device, by it's very existence, says that the Captain has something to hide and/or prefers to ambush targets as needed.  This is far from the attitude that Captain Janeway tried to put forth in her dealings, and while there were times when a cloaking device would have been useful on the whole the crew benefited most from the honest demeanor they consistently presented to the new cultures they encountered.