I used to add a text on PDF files last month easily. Today when log in documentcloud.adobe.com, after opening my PDF file and edit PDF/Add text, it bring me " Add comments" although I dont click add comments link. Neither I add text nor edit an existing text.
I dont have subscription. I am using the free version.
Hope you are doing well and sorry for the trouble. As described, you get Add comment box when you try to edit PDF.
I have checked your Adobe Account with the email you are using on this community and didn't found any subscription or premium service.
Adobe Acrobat Reader is a freeware application with limited functionality. It is used to view, read and annotate the PDF file. For more information please check the help page: https://helpx.adobe.com/in/reader/faq.html