The problem is "how" they do it....... in a nutshell ...... Adobe Illustrator does it better....
Whether you are talking about creating an image from scratch, (and to do this I am not able yet), whether you are talking about to vectorize a raster image......
When I started in 2015, vector images were made only by Garigor, first I tried with Inkscape, (free), but the quality is poor, later with Corel Draw, but it does not import and saves the svg images. After I downloaded Illustrator and I had to learn how to use it, just that little bit ....
If you talk about simple images, for those a little more complex, if you want images very similar to reality, they weigh much more than raster images......- Pictures much less heavy (Kilooctet).
This image of 800x480:
Spoiler: image
in png format is 665 KB, in bmp format is 1,09 MB, in NNG-bmp format is 353 KB......... if I turn it into svg with details closer to the original is 13,8 MB......
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