thrown out of your apartment if you failed to pay rent
This doesn't happen? I'm pretty sure it does. Try renting an apartment in a decent area and then never paying the rent. Let me know how long you're able to stay there.
the hospital would make the pacemaker stop working
The hospital will never install a pacemaker if you don't pay in full up front or have medical insurance that will guarantee payment. They'll happily watch you die in the ward if you can't pay.
Your lawyer would tell your secrets and tell
the court you are guilty if you didn't pay his fee
Don't know enough about the payment of lawyers to comment here, but I'm pretty sure not paying your lawyer is a particularly bad mistake to make.
Your citizenship would be revoked if you didn't pay taxes
You get to keep your citizenship, but they will happily take your freedom and put you in jail. I think I'd rather lose my citizenship to be honest.
I don't understand your examples. Having your website go down if you don't pay the guy who made it sounds pretty normal. I have a friend who installs burglar bars on windows - if you don't pay him, he will come to your house with a crowbar and take those burglar bars back regardless of how much of your house he has to break to do it. He still has plenty of customers, since it's standard practice in that industry to take back the burglar bars. They argue (successfully, it seems) that the bars are still their property until you pay them.