I suppose the conspiracy theory answer is that the Democrats only became motivated (or petty) enough to illegally(?) attack the WikiLeaks website after Assange caused Hillary to lose.

For most of the period between her losing the election and now, Trump has been in power, and Biden has had more important things to focus on than getting revenge against Assange/WL/Russia. (Also, it would be hard to maintain plausible deniability if the website started failing right after Biden took office).