When uncompressed and unpacked, GIMP is 112.25 MiB and Krita is 189.45 MiB on Arch. Which doesn't seem like a lot to me these days given their feature set, bundled stuff etc.
Meanwhile I can do without, by using my browser. What doesn't seem a lot to you in terms of resources and space is a blessing to those with more limited means.
For the vast majority globally speaking, wouldn't bandwidth be the limiting factor?
Also if you have a slower computer wouldn't running everything in Javascript be the last thing that you would want to do.
Furthermore if you where to measure RAM usage between the apps I bet GIMP would be far more conservative with the same load.
Also if you are editing images for a living 100 megabyte really isn't that much? Lets say you have RGB images of a resolution of 1920x1080. Sixteen or seventeen of this would be 100 MB already? If you are using layers you quite quickly reach this amount of storage. So the size of GIMP is really negligible.
The only definition of someone with more "limited means", where this would be better is someone who is using a chromebook but still has a 1st world tier internet connection. I'd be happy to be corrected if I am wrong however.
