Earlier quoted context omitted.
English is currently popular because money is always popular
This elides a lot of history, despite being glib it's mostly correct. If English wasn't as easy to learn as it is, it would have been destroyed though. The absolute selling point of English is the fact that since it has no proper rules it's the "glue" of European languages, it's the bash of human linguistics. Ugly, crude, nearly impossible to master if you're not using it daily and all it really does is pin together…
Anyone who thinks English has "no proper rules" clearly has never had the joy of learning English as a second language.
(Or maybe they have a really warped notion of what "formal rules" mean when it comes to languages. There are no natural human languages in the world that are dictated by formal rules. All formal rules are after-the-fact descriptions devised to explain the language that is already there.)