Earlier quoted context omitted.
A perfect killer example is globally accessible prediction markets. They always get shut down by governments. Isn’t it crazy that you currently can’t place a bet on a horse race or a presidential election in the US?
Do you have any killer examples that aren’t, um, totally illegal?
Killer examples include any products or services which would provide a net positive value to society but are currently outlawed within various geographic territories for superstitious reasons and/or to protect existing industries from competition.
Prediction markets are an excellent example here: a substantial body of research now indicates that 1) prediction markets are superior to all other strategies in predicting any quantifiable event (because they are “meta tools” which inherently incorporate the best information from all strategies) and 2) non-private markets can’t be used for manipulating elections, sponsoring assassinations, or incentivizing real-world action of any sort. (In any prediction market with a public order book, any attempted “action-incentivizing position” can be consumed by arbitrage until all that remains is a measure of the event’s real probability). For several decades, researchers from dozens of universities have lobbied for relaxing the ban on prediction markets in USA, with little progress to show. Until that ban is lifted (which could take decades longer), blockchain-based prediction markets will have no domestic competition.
Also worth noting: even in the presence of legal, centralized prediction markets, decentralized prediction market protocols may still be competitive because they require far less counterparty-risk, allowing them to safely support higher volumes and larger positions.