Scroll down to the bottom of the page, they're sponsers of mangago.
No they're making money off of this, which is more illegal than simply distributing the manga, but Mangago(and I assume their sponsors) do not care. You don't have to purchase anything for them to make money. They get money through ad revenue.
Guys, serious question. Why has the manga URLs been replaced with fashionlib and other celeb sites instead of the usual mangago.me?