1. The max supply of a coin :
How does coin maker define it ?
Why there is some coins with infinity supply as ETH, or unknown max supply ?
What if coin maker print more coins when it reach max supply ? So they will have more money ?
It completely depends on the entity that initiated the project if they want a ceiling on the supply or not. They should also be able to increase the supply without legal repercussions, (barring technical limitations but those are unlikely) because the coins themselves cannot be regulated by law; just their use. As a side note, increasing the supply will almost certainly affect the price negatively. Cryptocurrencies are mostly priced on available supply vs the demand, and if the supply increases while demand does not, there should be a price drop as demand is met.
2. ICO vs IPO legal :
The legal responsibility of a company which has a coin issued for crowd funding as many coins in the coinmarketcap now ?
What if they close the project and open the new one for selling their coin again ?
In the near future, when they release their application which use coin/token for using , what if they don't want to use coin but cash only , will the coin be burn to the air as nothing ? Or it turn to be as stock of a company ?
ICO regulation depends on the country. Here is a site with a quick summary of regulations in multiple countries:
https://btcmanager.com/current-state-of-ico-regulations-across-the-globe/If they're unregulated in a certain country, they're free to close the project and start a new one with little, if any, legal liabilities. I imagine regulations can stop the second scenario from happening, but I've never heard of something like that unfolding.
