Adobe Acrobat 2020 Software

Can someone tell me how G2A (specifically Royalgamesstore) can possibly sell a lifetime license of Adobe Acrobat 2020 for $80?  Plus, if I go to this website at different times, the price even lowers. This is so very weird.  How can this possibly be?  Is this actually legitimate?  FYI I actually purchased a license legitimatelly and my serial number [REMOVED]

If you can copy this link and paste it in your browser, you will see what I am referring to.  Or utilize the pdf file I attached.  Would appreciate hearing from anyone at all.  Thank you.

https://www.g2a.com/adobe-acrobat-pro-2020-pc-adobe-key-global-i10000221270002?aid=13264465&er=0af8191c3af6e5ab1f9460473377a147&___language=en&utm_source=google&utm_medium=surfaces&utm_campaign=gshopping_US&utm_content=surfaces_across_google&adid=GA-US_PB_DIGI_PLA_SSC_AllProducts_&id=14&gclid=CjwKCAjw5NqVBhAjEiwAeCa97bL75Y25K_0hInehuE34wjaJ1l0e-zHEpiv_9PzwUzXLtB71S2l6LRoCUoYQAvD_BwE&gclsrc=aw.ds