Are characters from PSAs allowed on VSBW?

[Ztesrxgdfjcvgkbh]

I couldn't find anything in the rules about it so I was just wondering if characters from a PSAs are allowed on VSBW or if it's too much like advertisements or would be controversial?

What a PSA is for anyone who doesn't know

 

[Ciel_Trinity439]

Can you give an example of a character from a PSA?

 

[Ztesrxgdfjcvgkbh]

Can you give an example of a character from a PSA?

Yello Dyno