In reply to Paulo.

They are a success in the UK only and this is the country where Cheryl Cole and Olly Murs are multi platinum artists. They are not successful in any other major music market. Chart run for LM5:

Italy 22 > 68 > Out
Germany 22 > 87 > Out
France 55 > 146 > Out
USA 40 > 156 > Out
Japan 60 > 96 > Out

Even BLACKPINK singing in Korean have had a Top 40 hit in the USA.