This has really just become pathetic, you're like a dog with a bone that won't let go. And now the number has changed again, so again I question the source. If you're so sure about the source why didn't you link to the place where they provided this tidbit of information.
But for a second lets say the budget is $350M+, I don't believe that but for the sake of argument, so what? How does that affect you? How does the affect the overall movie? How does that affect anything other than Disney's bottomline? If Disney wants to spend hundred of Millions on a movie, that is their right as a studio. Your only right as a moviegoer is to decide if you want to see it or not, and I know you have already decided you aren't going to see this one. So again I ask, how does this affect you? You've already decided you weren't going to see this one, so this has no impact on you whatsoever. And its not like Disney is going to stop making MCU movies, or even movies with Mackie in them as Cap. So what does it do other than to clog up these threads with misinformation and rants.
Back on the budget, I think what people have really gotten confused by is that its likely this talk about a $350M+ budget is really talking about budget+marketing costs, which that I can actually believe. And because it got lost in translation by a bad game of "telephone" it became just the budget and people ran with it. But again for our purposes in regards to talking about the profitability of the movie we use the published number, not the unverified rumors that could very well be made up or at the very least misunderstood.