Some people who are not good in English language are most likely to make mistakes with their grammar on writing on some websites and it is not something that you will kill them for but try as much as you can to correct them to increase on their grammar.Of course there are some platforms I have visited before that were full of gramatical errors, but I don't allow it discourage me because I know that anyone can make this kind of mistake including me. So, I just try to correct it in my mind and read on so that I can understand what is written.