Monopolies like these are partially built by the demand side flowing towards the option of least resistance. In such case, the average person will float towards browser X when Y seems to, for example, become slower, take more processing power or pure peer pressure "I can't believe you are still using browser P, it is so slow!".

As demand floats towards few suppliers, organizations with the most value to gain from it will either look to purchase one of the current suppliers or increase investment to outpace its competitors. In time, the market becomes a monopoly/oligopoly due to both demand (customer) and supply (org/biz interests). At this point, the mono/oli has the means to change things, either slowly or drastically, to maximize their gains.

Unless a good portion of society takes further interest in keeping what they believe to be right (e.g. privacy) and put their money and time where their belief is, non-profit orgs or less agressive ones are most likely to lose 99 out of 100 times in the long run. This is a human nature challenge, not necessarily an entity problem.