What's the benefit of using emojis in CSS?

I've noticed a trend of using emojis for CSS classnames.

.🖖🏾-Vg{color:#ff4040}
.🖖🏾VDe{padding:.75rem 0;font-size:1rem}

It makes certain things more difficult. e.g. writing Selenium tests over these pages.

Is there a real benefit to using them? Security? Filesize?
Or are developers just doing this for kicks?

Edit: For the "Close (Opinion Base)" voters. I genuinely want to know if there's a development reason for doing this. I'm not looking for people's opinions here.