It refers to the effort used to produce the sounds. You apply more preasure with ð than you would þ.

Hard -> Vocalized, Soft -> Unvocalized

I’m not mad about it, I was mostly curious about the why due to the sounds

https://www.woodsplitterdirect.com/collections/wood-chippers

I’m not mad necessarily, just curious mostly. I could have sworn I’ve seen multiple doing this.

Just trying to get answers in case others saw this or do this and otherwise block other instances.

I mean fair enough, but the least they could do is use the right letter for the right sound. It’s driving me insane. I’m fine if people wanna switch up their typing or whatever, but PLEASE use ð for hard th sound and þ for soft.