Why have a lot of the ptc sites recently changed payment options?

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I have noticed that two sites that I belong to have changed their payment option totally. One site use to offer 2 payment options and now it seems that they have threw both of those out and changed to a payment option called Evowallet. I have never heard of this and usually only sign up for sites that pay with Paypal because it seems to be one of the most trustworthy ones out there. I do belong to a few that pay with Alert pay but do not like to do that. Just because I am not really familiar with it. But I am just wondering if anyone else has experienced this? And are there any of you that belong to Evowallet and receive payments that way?