In order to rank well in prominent SE you must obey the rules and guidelines. Indeed to prevent your site being banned.
Many people requested to show your URL.You are not showing up that. Is there anything to hide from the DP members?
if that was true, you could get a rival site deindexed by creating a few thousand backlinks to it.. there is probably other factors
doesn't look like its 'banned' to me. It may just not be ranking very well, because it's just an aggregator of duplicate content.
Not Copied from anywhere.. all of them are own contents. I don't know about the sponsored contents. Whether Google ban the sites for copying contents?
Most of the people on DP try and benefit by having a site that has no content and sells no product or service. It exists purely for the clicks and advertising. That's a garbage site I hope all the search engines find a way to purge from the 'net.
If your site PR is still there then I think your site is not yet banned. Try to do some back linking using authority sites.
no you don't. In fact, it's not even possible, because different search engines have different rules (things they'd LIKE you to do when they're not raping your content for their own indexes).
Are you sure it was completely banned, or Google were updating, sometimes new sites just vanish, but they come back up after a few days