It's important to relegate baseless accusations or incorrect information to misinformation - because it isn't an opinion. It's incorrect. Untrue. False. Not based on fact. And that's how we end up with people taking horse medicine.
To repeat misinformation and 'create discussion' without researching and refuting where necessary isn't really responsible for someone with an online platform, as it just perpetuates the lies that are often planted by either people on the internet with too much time and too few brain-cells, or, in some cases, the Russian intelligence network and/or their army of spam-bots.
The $750 billion is not a demand. It's an estimate in an economic plan, not a request for money, based on the damage Russia has already done and what it will cost to rebuild (source: https://www.forbes.com/sites/madelinehalpert/2022/08/02/war-has-caused-108-billion-in-damage-to-ukraines-infrastructure-study-finds/?sh=6671ac8223e5)
Ukraine does have a problem with corruption, yes - it's long and historic and, arguably, being battled by Zelenskyy.
Ukraine does not have an active Nazi problem (source: https://jewishjournal.com/news/worldwide/345515/statement-on-the-war-in-ukraine-by-scholars-of-genocide-nazism-and-world-war-ii/) beyond the few right-wing thugs with swastikas tattoed to their foreheads which you will sadly find in any country in Europe. And yes the CIA did dodgy sh** after WW2 in some cases - but I feel like that's more an American problem than a Ukrainian one.
I'm not saying 'you can't look into these things' - or even 'you can't speak about these things,' you can do what you like and say what you like, of course! (So long as you're abiding by the law in your jurisdiction, I guess.)
But I, and I'm sure at least some of the people you're responding to with this post, think that people in general should act carefully and responsibly when repeating what are - to put it bluntly - conspiracy theories. Lies travel faster than the truth (source: https://mitsloan.mit.edu/ideas-made-to-matter/study-false-news-spreads-faster-truth)