The IMF has said it could put together a loan package for Venezuela "in less than six months" if there were to be a political transition.
No transition, no money for Guaido to implement his plans (taking over the oil for example). They aren't recognizing Guaido for several reasons one being they would be giving money to someone without the authority to secure what it's spent on or reliably pay it back.
They are cutthroat capitalists willing to do anything to make money, if they aren't backing Guaido it's because they don't think he's a smart bet. Nothing in the news or events on the ground indicate that's going to change.
Also worth noting despite some impressions Guaido has been seeking IMF money since the start and the IMF members have consistently failed to recognize him in sufficient numbers for more than 2 months now.
WASHINGTON, Feb 7 (Reuters) - The International Monetary Fund is still awaiting guidance from its member countries on whether to recognize Venezuela’s opposition leader Juan Guaido as the country’s legitimate head of state, IMF spokesman Gerry Rice said on Thursday.
For all intents and purposes they've made their decision.
For those unfamiliar with Venezuela they may be surprised to find out the military has always been corrupt. At least long before Chavez or Maduro got there.
Here's a youtube video from CGP grey explaining how "ruling" works in the real world regardless of the country (similar to my explanation at the very start of all this). 4:00-6:00 covers the meat of it.
Hopefully that's helpful for you RVB.