With 50 million + websites online today, webmaster worry to much about being banned.
Same content is a very very very small issue and getting banned for it is near impossible.
If fact I have done a google search and found same content website ranked very high ,sometimes right next to each other.Even found redirected site ranked 1,2 on searches.
Let’s say you park 3 domain to your main site,google still indexes them all.
I have 10 domains parked to main website and google spyders them all the time.Search engines are not as much about finding site to ban, as they are
about indexing and making searches better.
So all you webmasters chill out a little will you.
Life is too short to worry about everything !!
80 websites and growing….