Thousands?
It's a 60kb Javascript file, seems quite static to all users, and appears to be cached and delivered from CloudFlare. I don't think their free accounts have bandwidth limits, just feature limits, so... it's probably more "pennies" on hosting than "thousands." Given the popularity of it, it's a good bet that it's almost always in the CF cache, so very few requests going through to the origin.
This is more of a "You could host it on a home ISP" type project with how well caching systems handle it. Or toss it in a Google Cloud Storage bucket, which has reduced egress fees to CF and it'll still be constantly cached.
Nothing I see indicates it's the slightest bit expensive to host.
> put Cloudflare in front of my website; then more recently, we migrated the hosting to Amazon S3, which can scale indefinitely as long as I’m happy to pay for it.
...
> it does cost me a bit to keep the servers up to run Wordle
https://techcrunch.com/2022/01/12/josh-wardle-interview-word...
https://bafybeic4blel5vf4il73n3nzt6vw7npsov6or3cp3myjms4npii...