There are certainly ways, they just disadvantage other (legitimate) players.
For instance, a very simple solution is to IP lock accounts: the moment you login, no one else can login to that account using a different IP for (say) 24 hours.
However, that would hurt anyone who wants to play on their home PC and at work, on a different home computer (or Steam Machine), at a coffee shop, etc. Also anyone on a VPN who resets their VPN would be locked out.
There are other, more complicated solutions (eg. allow 2 IPs per day), but they still disadvantage legit people, and impact illegitimate account sharers even less.
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