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I'm not completely sure that the price for 1btc will reach $1mn and the price tag of $100m is already something not real. if bitcoin were accepted as a form of payment all over the world, perhaps 0.01 btc would bring a huge income, but if you really look at it, it is unlikely that something will turn out.
10 years ago if you have ever looked, many people never believed the price of Bitcoin would hit $50k, in fact Bitcoin has crossed $60k
it may take a long time and also 70% of the world's population for Bitcoin to touch $1 million, but I'm sure this will happen in the next few decades
Don't compare the price of bitcoin in 10 years before and the value for the next 10 years more.
Bitcoin will never reach 10 million dollars each so that is not that best interest to compare.
100$ wasn't enough if He invested when the price of Bitcoin at 40k because even when the value runs up to 1 million dollar still that amount will be more than 2000 dollars only