The best course of action would be to contact thum's customer support and explain how you would want to use the service. If it's doable, I am sure they will provide you with the information and setup instructions you need to configure their service with Wordpress. If not, they might suggest the next best thing. Send them an email to see what they say >
https://www.thum.io/#contact.
I don't get why you think i need a screenshot generator service.
The problem with RSS feed aggregator is that it downloads raw data from the source. Editing the data and then restructuring it to fit your blog theme takes time, if images are not present then it takes a whole lot of time, and it can consume more time than editing the text content. What you can do is use these AI image generators which can reduce your time and energy. To generate prompts there is a plugin for ChatGPT, all versions included and it is known as AIRPM.
It can generate prompts for ChatGPT where you can ask the AI to generate a prompt for image-generating AI. You will need to test the prompt first on different platforms to see if they fit your requirements. Mid journey works with prompts generated from ChatGPT, you can use the plugin to generate your prompts. The work would be hard in the beginning but later on, it will be easy.
If you do not want a plugin then use Bard, with the recent upgrade it is now far better than the other AI. BTW, how do you plan to monetize your website, and has your website ranking improved with the recent Google update?
The process of the RSS feed aggregator is automatic in my site, for that i use the plugin WPmatico, that way i don't have to make each post by hand.
The idea if generating images with AI isn't bad at all, but implementing it is complex, i have no idea how to mix the AI with WPmatico to do all auto. And don't think this is a must. In the end 90% of the post from the RSS has their own image, is only a small number of post who doesn't have one. So, isn't a big issue.
