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nobody cares, do you have 50 000 accounts from one laptop or just one.
if you manage to register 50 000 accounts, then go for it. There are even services that register accounts for you with the SP you want on your new account. The price is cheap.
I'll tell you once again, this is nothing like facebook or any social network you ever registered on.

I don't think that anyone does that. What's for?
Nobody is tracing your IP.
it is based on blockchain, right?
You upvote, block created, added to the common chain, done!
Why would someone care about your ip? who needs to watch after you?
If your post is annoying, steemcleaners, cheetah or whoever else come and flag it. That's all.
You can claim yourself as moderator, let's say, and flag whatever you think is wrong, why not?
Everyone has same rights. The only thing that is different - steem power.
Invest 10 millions of dollars, raise your steem power and go flag steem creators if you want. Then you will dominate the platform.
total freedom and everyone is with the gun =)
just some people buy tanks =) you can be one of them