That would only move the problem. That plugin would still need a Git repository, an issue tracker, tests, and an update mechanism. Or are you trying to say you don't care if this specific part of yt-dl gets deleted from the internet by RIAA?

There are multiple sides to "defending" a project like this. One of them is avoiding to trip the run-of-the-mill scrapers. The takedown was serious but we don't know what triggered the lawyers' attention in the first place. IMHO a simple runtime obfuscation would remove that particular attack vector, once coupled with some plausible deniability (i.e. deleting all downloaded data once tested). At that point, YTDL is still on RIAA's generic shitlist (which will require other mitigations to survive) but at least doesn't get flagged every week by a scraper.