Can We Cheat Steemit ?

Can we cheat Steemit ?

I mean is it possible to make multiple fake accounts and then use the upvoting system to your advantage ?

Can't we make more then one account without being detected and then upvote the posts from multiple accounts. And also put the useless posts for Curie ?

Also if my wife use my laptop and makes an account, she is going to upvote almost all of my posts and vice versa, would Steemit take it as a scam ? Because she'll be using the same laptop so 2 accounts would be accessing Steemit from single ip. And also i if she earns good SBD in her account might send her steem power to my account or vice versa, will it not be declared as scam accounts by Steemit ?

Thanks in advance for the help.

Regards,
a4illusionist