This is now the new trend, every exchange wants to do ieo no matter how shitty the project is. If you are investing in any ieo, consider it a big risk. If it pays off, fine. If it doesn't, we learn.
Definitely, investing in either ICO or IEO has its own risks no matter the exchange platform hosting it... Big exchange platforms hosting IEOs do not gurantee that the project will be very successful. Most exchange platforms are just interested in making money so they do not mind hosting an IEO for a shitty crypto project... Investors just need to be very careful in the kind of IEOs they invest in....