I understand your frustration and share it, but I personally believe that we are at the point where this behavior (i.e., failure to act) should be expected of tech companies. The economic incentives of the companies who run the most popular social networks seem to be negatively aligned against robust responses to the propagation of bots and disinformation, and that doesn't appear likely to change.

I also wonder whether the mitigation strategy for this type of societal threat is not to be found via strictly technological means anyway since the line between bot and human actor appears to be blurring more and more as time passes and technology improves (artificial face generation, improved NLP, statistically-informed posting and behavioral modeling, etc.). Imagine how complicated the process of discriminating between automated and human-controlled accounts might become in ten or twenty years from now; it seems as though there will have to be some sort of public education component to reduce the credulity of human users in online environments - an adjustment of weights in the network of information sources among the general population, if you will, in a direction that de-emphasizes online content.