So sorry about that delay and the back and forth with the system.
My name is ***** ***** I am one of the professionals here on this site.
They have a donate button in order to help with the monthly upkeep and hosting of their services. If people are happy with the site, they are able to donate an amount ($5, $10, etc) to help the owners "pay the bills" for the site. There are many bulletin board sites that use this method to keep the site "free" while still having ability to get money from those who want to help them pay for the monthly expenses that are related to any site, especially one with more traffic than normal.
I hope that helps.
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Thanks and have a wonderful rest of the week!