How would you do it differently? Would you adjust for inflation or look for a different indicator like a rate of return over time or compare to an index fund over the same time?
Each company you select shows you how many today's-dollars you'd have today given the "same" initial investment. Given that, it seems to me it would make the most sense for the initial investments to be the same value, instead of the same number.
In this application, it would make more sense for each initial investment to have the same value instead of the same number, i.e. having an initial investment of however many dollars would be equivalent to $1000 2021-dollars.
In this application, it would make more sense for each initial investment to have the same value instead of the same number, i.e. having an initial investment of however many dollars would be equivalent to $1000 2021-dollars.