The mechanics of buying have very little to do with market dynamics. It doesn't matter if I can acquire bitcoin telepathically if the market is such that early adopters hold all of the power.
The reality of market dynamics has nothing to do with whether you should or should not buy Apple stock. The point is that the ease of buying something doesn't necessarily change the fundamental concentration of power, which is still concentrated among earlier adopters. You may still choose to invest regardless, and that may be perfectly acceptable.