One missing dimension for this comparison is how long it takes to get results.
I've been using Imagen/Parti/Stable Diffusion already as a replacement for "clip art" because it takes ~15 seconds to get results and they are free. Fiverr takes at least 100 times that long and costs $10.
For tasks where the exact content isn't important and you can't invest more than a few seconds or wait a more than a few seconds for results, generative models are already a great solution.
I've been using Imagen/Parti/Stable Diffusion already as a replacement for "clip art" because it takes ~15 seconds to get results and they are free. Fiverr takes at least 100 times that long and costs $10.
For tasks where the exact content isn't important and you can't invest more than a few seconds or wait a more than a few seconds for results, generative models are already a great solution.