If it is built on top of the steem blockchain then it can be different but still tap into the same ecosystem. Steem Power, Steem Dollars, etc should all move with you to any app using the blockchain.
You could start from scratch, or you could do one of the following:
- Partner up with someone like @kaptainkrayola who is building stuff from scratch for the blockchain - he made steemshovel.com
- Download steemit.com source code and fork it to build your own version
It also doesn't have to be @kaptainkrayola. I happen to know him and happen to know he is building most of his code himself and also working with @fabian with regards to some jsnode things. I do not believe he is using piston, or steemit.com code at this point.
As to privacy... that really depends on HOW private. Being able to see the wallets and transaction information is critical to stopping cronyism and corruption. Anyone can follow the paper trail. If by privacy you mean it is exposing information that should be private that then can be used to doxx you then yes the is potentially a big issue.
As to women... yes women are more often targets for such actions, yet it is happening to other people.
I have @feminism trolling me just like he does you and @beanz.