On Android, Termux (https://termux.dev/en/) has packages for the Rust toolchain, wasmtime, and wasmer.
This might be enough to run wasi containers, but might not have the sandboxing that other runtimes have.
Far from what I had imagined. If there was a OS that executes this one thing well there's hardly any reason to choose any of current enshittified alternatives.
We will launch very soon the Wasmer SDK with support for mobile (androids and iOS)