Each user will have to tap the spoiler message in order to view it

http://www.adweek.com/

Discord allows users to hide certain text so that others will need to tap their message to read it
Discord

By Brandy Shaul

41 mins ago

Did you know that Discord allows you to mark your messages (or just parts of your messages) as spoilers? For instance, if you’re chatting about the plot of a movie, you may want to mark your message as a spoiler in order to avoid sharing too many details with users who haven’t seen the film.