Do advertisers have a responsibility to spell correctly?

I definitely think that advertisers have a responsibility to spell correctly. Advertisements are made to be seen and read by the general public and with the decline in writing ability, I think spelling correctly becomes even more important. Yes there is the argument about using language which is appropriate to the target market - 'round Essex' possibly works colloquially but in print, I have my doubts if this is right.

The Guardian followed up the campaign and avoided the 'round/around' issue by using 'cycle' through Essex. Whereas Google's 'Did You Mean' got it right with a 'Did you mean cycle around Essex'.

What do you think?