I don't think that will end the hype of ICO, because ICO is the first step for developers which what th realize their ideas and it the easy way to get financing for projects. But i suppose should be made some changes for legal regulation ico which will help avoid scammers. It should be made as soon as possible.
Cryptocurrency is already popular, there is alot of hype about crypto and everything connected with it in over the world. I believe in future cryptocurrency become the main method of payment and it will change economic, i hope in better.But i don't think it happens very soon.
Некоторые менеджеры решают эту проблему введя доказательство участия - пост в ветку с вашего аккаунта в каких компаниях участвуете. Так же если нужно постить отчеты в ветку - это исключает мошенничество такого рода. А вот там где отчеты не нужны или через гугл форму подаются надо постоянно мониторить свой ник.
Of course wallet is better to use for tokens. When your tokens on exchange, you don't have private key from their wallet, so technically you don't owner of your tokens. Besides exchange can be hacked and you lost your money. Always withdraw your crypto after trading.
I am sure bounty is a very good opportunity to get profit but i don't think it is passive income because you have to do a lot of work to get tokens. The main work is to find good campaign, you have to analyze a lot of projects to find some worth to join.