However saying there is no conspiracy at all might be too simple as IMF mostly requires countries to follow certain economic rules that can be tough on their people and poor countries do not always have other options.
For instance IMF is wary of El Salvador Bitcoin choice because they prefer stable investments for development like building roads or schools as compare to these digital currencies. So while IMF wants to help its methods and expectations can clash with new ideas like using Bitcoin and El Salvador is facing this and my country Pakistan is facing now after announcing 2000MW electricity for Bitcoin Mining.
Again, poor countries are not forced to hold their currencies in a certain currency. In fact, any country that is less well off is likely not going to do so, because it doesn’t benefit their monetary system. This is not a conspiracy either.
You practically outlined the clear reason why IMF is against this entire proposal in the first place. Sustainable economic growth is not achieved in the long term by being exposed to unnecessary risks with uncertain returns. IMF is absolutely right in enforcing this and there is no argument that Bitcoin could be better than developing their subpar economic system. This isn’t a gamble that anyone, much less a country that is so heavily reliant on loans and aid should take.