I didn't think much of this at first. Why do I care if my posts are on both the Steem platform and the Hive platform. But as I think more about it, what a great promotional tool it is to have a whole bunch of links on STEEM that point people to the HIVE chain.
In a bit of an FU to Justin, you can choose to either delete your post content from STEEM and replace it with a link that directs people to check out your content on HIVE (my choice). Or you can have the title of every post you ever made changed to "Moving to Hive", with the content of the post being replaced with the following lovely image:
So I created 661 links to Hive, representing all of my posts over the last 3 years.
How many links can you make? The instructions are easy, go show 
@engrave/steem-pruner-quick-way-to-remove-posts-from-steem-the-censored-blockchain