A subscription is not required to generate AI content.
For example, https://stablehorde.net/ provides a cluster of servers that anyone can use, for free. They have REST APIs described on that page.
A lot of the more technically minded folks would probably prefer directly invoking their local stable diffusion instances, which have plugins to expose the services as APIs.
Basically, these services are available for easy integration at the HTTP level. They are practically begging to be used.
Beyond generative AI, also worth noting are tools like Facebooks Segment Anything which can - select anything. https://segment-anything.com/
The digital art landscape shift is absolutely tectonic, and its as easy to integrate as an HTTP call. Again, let the community do the work! We just need the door opened.