That's a different discussion and should have wide ramifications with way more nuance that "allowed" or "not allowed", if suddenly tomorrow Adobe or any other were able to create a model that is able to replace any existing job position how we should it be managed? The societal ramifications are complex, is not binary and should be discussed by politicians and intellectuals, not by corp marketing teams.

They can already replace stock image sites. Why pay getty/shutterstock an obscene amount of money for a photo if you can simply generate something similar with a prompt for free?

I checked how much some images cost on getty images - and their prices are ridiculous - 100-1000eur or more. No wonder they are trying to sue stability.ai now.