No, usually, as long as you're accessing a file, it's moved back to the top. This means that only purged files are the ones least accessed.

There is a common misunderstanding between pinning and redundancy. While pinning does provide protection against garbage collection, it doesn't automatically make the pinned files more accessible. Instead, files that are frequently accessed are typically cached on multinodes and generally have better availability than files pinned to a single node that might happen to be offline. so IPFS as a network favours active files

But files that are important but not accessed often run the risk of being lost?