At its discretion. Some of the ICOs are becoming scam and the price is lessen after they listed it on the exchanges and that is why many people are complaining about how they've scam those projects.
There are several sites that you can get information about bitcoin and crypto market. Bitcointalk forum and reddit are 2 of them. You can also join telegram groups and follow conversations there.
In first, you must analyze if the ico is good and have potential to be huge in the future by doing research by your own. Read the whitepaper and check their social media if there is an update from time to time. Check the team if there are linkedin account for legitimacy of that person.
In my experience realized that enough is not easy to determine how the project could shoot as skam projects regulations, too, can profit to give. The first thing I always is who is the campaign manager. I've been scammed not only once nor twice but trice
Yes, i think is the problem since there is no transparency on the page they just promise that you get and i think that is a problem because there is no assurance that you have done the job completely since stakes are not shown and i think this is a broken system because it either be used on scams or honest people that dont get credited for the work they have done.
Don't wait. If you can keep growing potential for Ethereum right now. You should invest in Ethereum right away. But don't invest too much. We need to diversify.