Centralized coin ? which altcoin is not centralized ? all of them are centralized right now. All people are talking for decentralized world but all of them are trying to centralized their coin, so u can invest without doubt all alts are centralzied right now.
there are many ico sites but some of them can manipulate with ratings and they can cause not believing so one of the best ico platform is https://icodrops.com you can follow up and make your compare of icos to the other websites
In the decentralized world you cannot say how much the cryptocurrency or other coins are safe , because it has to do with individuals an all the responsibility is upon the individual like in which market they trade or what they do so being safe is in the hand of individual by being careful what they do
Unfortunately I am the one that came up a little bit late to the world of cryptocurrencies and I had the chance to lose some of money because I bought around 0.5 BTC when it was in 9Kusd, now I am in minuse because of its price its around 7.5K but does not matter I am still positive for the future of BTC and other altcoins