On what topic can an exchange be created in our time?

Question

Project management

As I understand it, an exchange in the broadest sense of the word is a legal entity that organizes a market for anything: definitions from Wikipedia
This is a place where buyers and sellers of any goods or services meet. They find each other there and carry out transactions. And the exchange takes its fee for organizing this market in the form of commissions, subscriptions, paid services, etc.
Of the common examples: cryptocurrency exchanges, freelancers, commodity, stock, labor, etc.
In general, you understand what I mean)
Actually, the question is: on what topic in our time can you create an exchange that works online in the form of a website? In your opinion, which market of goods and services is not yet sufficiently developed and organized? Is such a project possible for a single developer or is it better to immediately assemble a team?

Answer 1

No kidding:
- drone exchange (promising);
- (relevant already yesterday) exchange of railway wagons for grain, crushed stone (deficit of wagons by September / November) - to make futures for wagons, or at least the logistics of transporting bulk goods by rail;
- you won't believe it, but there is a demand for abandoned forums from mybb.ru - I would buy a dozen "flying Dutchmen" on the stock exchange for advertising and I'm too lazy to look for it (you look at abandoned forums on webtalk.ru and ask for the admin panel here: forum.mybb.ru/ viewforum.php?id=30 ) - in principle, you can issue through Telderi later, and lots specifically for forums - make a separate site;
- exchange of fuel-free generators (demand it will be mad), as well as the proposals of "perpetual motion machines" from the inventors ... then you don't need a development team, but a combat-ready army to protect against oil bellies));
...)))
PS Well, probably the emerging market of democracy, in the true sense: "the power of the people" - I'll explain. What prevents you from organizing the movement on social networks, processing applications, competently drafting appeals legally and holding referendums, polls, voting in electronic form? Those. really make the exchange of democracy. Sorry, the idea is still damp, for the holidays with friends we just talked about this topic, but the essence, in principle, I think is clear))
few "engines" and "levers" for change, but a lot of stupid bills that need to be revised. Political parties have played their position/opposition and are as far from the aspirations of ordinary people as 1917 from 2018. The whole structure is mossy and incapacitated. But specifically a movement like "the soul of the people"

Answer 2

There are no empty niches. If someone knows this, he is rich without five minutes and is unlikely to shout about it.
You can do anything about anything, the main thing is to do better than competitors (SWOT analysis will help you) and have a budget for promotion. At the moment, starting a web project with a budget of less than 100k killed raccoons is almost impossible.
What kind? You wrote two lines about him. But a loner can do anything if the hands are in the right place. There is a question of timing. You can start to saw the project yourself and after 8 years realize that it is no longer relevant. Therefore, first you form the TOR, well, at least a brief and a prototype. You study the market, evaluate the obsolescence of the idea, the timing of reaching the break-even point, etc. And from this you decide what composition to cut it and on what.
space tourism. And I'm not kidding. There is still a niche, but the entry price is too big for me.

Answer 3

Most likely you will not find a free niche, and very narrow-profile most likely will not be interesting.
Alone from scratch it will not be possible, at least a couple of like-minded people will not interfere, as well as investments from the outside.