Go an and run a site that serves massive amounts of cat pictures for peanuts!
Well, yes, serving static HTML is easy. Serving images is kind of not hard either, because you have free unlimited traffic, don't you? Some hosting plans offer it. They just limit the egress bandwidth. So maybe you need a few more servers to cope with it, just like $50 a pop. You're not gonna need any CDN, people further away from your DC will just wait longer. Or run your servers from two regions, it just takes duplicating your collection of cat pictures, should be peanuts.
Then, you need to store these terabytes of cats. On rather fast disks because else the disks will be the bottleneck, and cats will load very slowly for some users. It would be terrible were something to happen to the collection, so you need some backup for peanuts, like some Backblaze, and maybe a second copy because Backblaze has no^W limited redundancy.
Then, well, you need to monitor all that and sometimes fix issues, because cloud infra is highly available but not highly reliable.
Then, where do the cat pictures come from? Allow anonymous uploads! Or register users and allow uploads.
Now analyze each picture so that it's an actual cat picture and not child porn or a warez archive. Resize them to match your standards. Yes, this is simple, just run a RNN that detects cats.
Then, curate the incoming pictures so that they are actually reasonably interesting. Just maybe hire a few people to do that for peanuts somewhere in Africa.
Ah yes, you want to also deduplicate images; run some image hashing algorithms; use maybe just one or two GPU instances to do that efficiently. And you gonna need a DB, a simple one, that will never need any administering or fixing, won't it?
Well, yes, now you can run that site for just several grand a month, making it your day job, because you're well-qualified to maintain every part of it. Enjoy the peanuts.