There are still old places like Stickpage[0] and Newgrounds[1] that are up. They feel like relics from the early web before mass consolidation onto social networks like MySpace took place.
Newgrounds is helping develop Ruffle, a Flash player built in Rust that runs (via WebAssembly, I think, though it technically supports ASM.js via emscripten) in HTML5 browsers: https://github.com/ruffle-rs/ruffle