Thanks for those pics Sergiu, they help make it clear! :thumbup:
Altho, just to clarify a bit, those little tabs across the grooves we can see that have the lines embossed across their tops (clearly shown at the bottom Right of the bottom Right pic above - they are the only tabs you can see in that pic!

)
AREN'T the Tread Wear Indicators, they are just tread stabilisation blocks & breakers in the grooving intended to force any water, slush etc to leave the grooves as the tire rotates. :lecturef_smilie:
If you look just a little further around the tire, there'll be some similar tabs across the grooves, but they'll be a little lower/deeper in the grooves, they won't have the embossed lines across their tops, and if you look at the sidewall, just on the edge where the sidewall starts to turn across into the tread, there'll be a little
Triangle marker embossed with its pointy end pointing at those little tabs -
THEY are the 'real'
Tread Wear Indicators. In the Top Left pic, the first pic above, you can see the 'real'
Tread Wear Indicators a little further away from you as you move your view around the tire - they are near the top of the visible bit of tire, closer to the middle of the pic; while those more in focus & closer to the Right edge of that first pic clearly have the lines across the top of the block on the top right tab, & so aren't the tabs you need to watch! You need to look for the little Triangle marker on the sidewall just at the edge of the tread, & you should be able to see it fairly clearly once you know what to look for.

hyea:
Going by the '
REAL'
Tread Wear Indicators, you probably had maybe another 1000 km or so of wear left in that tire before it hit the minimum safe tread depth on the left most/lower tab....

But yeah, the tire was clearly wearing more on one side than the other, and that needs to be fixed. :thumbup: