Compressed gif gets bigger

I have a gif file which is made bigger with compression. Why ? I know gif isn’t the best format but I tried to convert it lossless (or losslessly) to mp4, mov or webp and it only make it about 9 times bigger. I would like a function that automatically compare the size of compressed assets and warn if it gets bigger because arguably that is never the intent of the user.
Only ever a side-effect.

3.6M ├── transcendance_tranquility.gif 
939K ├── transcendance_tranquility_hu6a45a5541c100ecb57e6befebaaf963a_3645068_200x0_resize_q100_mitchellnetravali_1.gif 
4.2M └── transcendance_tranquility_hu6a45a5541c100ecb57e6befebaaf963a_3645068_400x0_resize_q100_mitchellnetravali_1.gif 

In this case the original image is 512 pixels wide.

GIF (as PNG) uses a losless compression (LZW), hence a “quality” seeing makes no sense. That’s different with JPEG and WEP, though.

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