Now I ask you, is this ingenious marketing designed to catch the eye with its brazen statement? Were they aiming for a viral following? 

It ticks a lot of boxes : 

• The 'Golden Arches' clearly identify the brand
• The location is very clear (though perhaps minimalist)
• The opening time is clearly stated

On top of all that, they've made sure that all their potential customers get a damn good laugh on the way!

Whether this is the fumblings of a naive printer or a purposeful campaign, it is largely doing a pretty good job.

If I ever make it to Yass (in NSW, Australia) I'm certainly going to stop by the sign and get a selfie in front of it.  Maybe I'll even take a homemade sign to hold up in front of it that says 'Kiss'...

​This won't be the last time you see me harping on about this.
We're all likely to make some mistakes with our grammar from time to time, particularly when predictive text takes over and tells lies about what we meant to say!
It's tough for the poor, overworked fingers to keep up with the pace of our demanding, outspoken brains. 
However, if you are a serial offender when it comes to grammar issues and you don't know that you're using the wrong 'your' and you think 'oh 'their' all going to 'loose' their shit over this' then please, please - don't write your own marketing or business material!!!
Get 'your' ideas together 'loosely' and pass them on to someone who won't 'lose' you customers by representing your ideas shabbily.  Otherwise, 'your' great ideas could be lost among a sea of 'loose' grammar.

Perhaps this was an attempt at irony? It always pays to ask a more literate friend if you're not sure about how a word is spelled or if you're using it in the correct context. 
Still it's unclear as to whether this is actually stroke of genius designed to make us all ponder the true message...