The structure of my business is confidential, both contractually and by best practice in any competitive market. I'm not here to prove anything or seek confirmation from anyone.
Nice, I have checked the transaction ids of your users' complain and reviews found on trustpilot. 1 from Foundry USA Pool, 1 is Unknown, and 2 is Viabtc, so what are the other 2 or i say 3?
Don't tell me you are "partnered" with viabtc to charge people flat $25 then push it using viabtc's free accelerator?
Also having a flat $25 fee as you claim is not how bitcoin transaction fee works. Yes, your "business" will profit if tx fee is too low, then your business will be at risk if someone has larger transaction size yet bitcoin fee is too high and then you still ask flat $25? your mining pool partner will be at risk too accepting such low fee when the demand of tx fee is too high. Obviously, scam is scam.