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Yes, I know that part. Many people are selfish and greedy.
When I use the Actifit app (nowadays rarely), then I also post on both of the blockchains, but not out of selfishness and greed. Actually it is somewhat sad that the events led to the hardfork of Steem resulting in the Hive blockchain. By the way, everyone who had a Steem account at the time of that hardfork, they automatically got their account (with their balances included) cloned to the Hive blockchain. This split the community. Some people continued with Steem, some people started with Hive, and some people done both.