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Training on generating SVGs directly at all is already fairly niche. Generating full scenes with a cartoony character is even nicher. But there's plenty of non-pelican cartoony SVG content out there (created, not written, by humans with vector design tools), and more importantly, plenty of vision models to give feedback on the output (just raster as a png). You could easily hill climb this niche skill, if you cared.

It’s not hard for a visual model to score the quality of that output though, which would be a pretty good fitness function.

I did that. This works to some extent but why bother. Sft brings you 99,9% there already. Rl helps more with syntax errors. Svg is code

They can easily afford 1000 human made pelican svg files if they want. I think you underestimate how much resources SotA AI companies have.

(I'm not saying that they did that. I'm just saying they can.)