If I were Google, I wouldn't try to pick up on the content, I'd be looking for characteristic access patterns. It's harder to catch uploads, since "new account uploads lots of potentially large documents" isn't something you can immediately block, but "oh, look, here's several large files that are always accessed in consecutive order very quickly" would be harder to hide. It's still an arms race after that (e.g., "but what if I access them really slowly?"), but while Google would find a hard time conclusively winning this race in the technical sense, they can win enough that this isn't fun or a cost-effectively technique anymore (e.g. "then you're getting your files really slowly, so where's the fun in that?"), which is close enough to victory for them.
So, I'd say, enjoy it while you can. If it gets big enough to annoy, it'll get eliminated.