PDFCrowd might be a bit more popular than Optery. We know about 1 link to it since March 2021 and only 1 link to Optery. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I opted to pay for optery.com to do all the legwork for me. It’s a yearly subscription but doesn’t seem too steep for what I get. They send you regular reports with before and after screenshots of said sites showing your information being removed. Source: over 1 year ago
To follow on with this, I've used https://pdfcrowd.com/ too. Source: over 3 years ago
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