Digital Ocean has cheap servers too. AWS is always there, but costs more. You don't need much.
It's not exactly a traditional blog, nor is it a traditional image board. Replies may not get through real time but if they are thought out and do not break US laws then it is likely they will end up on the site which I think is still a little better than some blogs. It's not for everyone. Well, its probably not for anyone other than me. My emphasis to Claude and Grok was to ensure it does not require JavaScript and makes a best effort to be WCAG compliant and respect peoples motion sensitivity preferences even if I never hire someone to certify it.
And simply use Cloudflare generous free tier to host your website and protect it from ddos.
If your static site generator (I use Nikola) has a config for publishing to Github it will probably work with any remote origin.