It's under threat of force so you can't be blamed for the non-consensual situation you've had thrust upon you, though I'd still applaud it if you found a way around it without having to pay the fine. This article is primarily targeted at audiences who aren't compelled to vote.

Your earlier voting was perhaps immoral given that you were trying to secure stolen resources for yourself though, but the fact that you vote under direct threat of force in general isn't immoral on your part. Voting for less government is probably the best thing you can do unless you can afford or dodge the fine