If you don't own the private keys and make sure that the code has been audited and is open source, as well as doing your own research beforehand on the company that is producing it, whether any public figures are involved/or just an anonymous team, then you don't own any coins that are stored on the wallet. You won't trust anyone on this forum with $1k, why should you trust someone just made a site and a program, and nothing else with the same thing?
This said, nobody deserves to get scammed. So i wish all the best to these people who got scammed, and hopefully they have learned a lesson.
This is great example how cryptocurrency is making scamming people and getting away without any legal consequences. Many many new peoples are getting scammed one way or other. ICOs are also great way for scammers to collect large sum. People are throwing money in ICOs madly.
This isn't an ICO for starters. Crypto if used correctly can actually help mitigate scams(chargebacks, hacked CCs etc.) but yes, its irreversibility is something that scammers love.