I assume we can then count the days until they simply block AWS as well? But that explains why they don't use one of these to keep the bad traffic away from their hosting infrastructure and instead of AWS eat all of it.
Very few S3 CDN IP address left with 443 port open, so greatfire.org carefully picked those and hosting content mirrors there.
Although what they operate is totally free speech, legal and reasonable, but it's like your bad neighbor in a VPS who eats all your co-hosting CPU, bandwidth and disk IO. You have no choice but move to somewhere else.