The site seems legit and most of the women are real, if not always sincere. These facts should be apparent from the number of messages and interests you get from quite ugly women, and a spectrum up to very beautiful or adorably cute.
From my experiences visiting the Philippines, it is true that Filipinas consider light-skinned American men handsome. You will almost certainly be tall by Philippine standards. Young Filipinas are also much more receptive than Westerners to older men, to the point that some young women there have romantic fantasies about older, foreign men.
Apparently, Many Filipino men do not offer much competition: frequently abusive, irresponsible, unfaithful, unaware even of the concept of satisfying a woman sexually, much less having the skills, and not financially secure.
There comes the problem. Most of these women are very poor. That makes you seem very wealthy and desirable, but also makes it hard to distinguish between the cultural expectation that generosity is a sign of good character, genuine affection combined with a legitimate need for financial help to get out of poverty, and outright only wanting your money. Their attitudes will range from outright scammers, through essentially monogamous prostitution, to unrealistic fantasies of becoming a princess.
The site will remove profiles of women who ask for money or otherwise are not sincere if you give them evidence -- so save a copy of your messages. Understandably, they will not remove a woman just on your sayso that could be from spite. The site does not block exchange of direct contact information nor charge for communication on the site. They charge a membership fee (lower rates for longer terms) to allow unlimited messaging with all members. The site therefore has no motivation to have you strung along by a fake profile. They do post suggestions for avoiding scams.
Remember this is an overwhelmingly Catholic country. Not only does that mean that the woman may be very sexually repressed by Western standards. They may also call themselves "Religious" when all they mean is a decent person,
There is no divorce within the Philippines and "annulments" are expensive and time-consuming. That means that a woman who is separated cannot be brought to the US. On the other hand, living together, including unwed motherhood, is fairly common, with such couples possibly referring to each other as spouses.