Hello Lilou, Welcome to the Forums.
Interesting exploit. When you say “People” are you talking about people who you are collaborating with on island creation? (I’m not familiar with any player-facing text inputs)
You should post this as a Bug Report (“New Issue”) in the bug reporting section. This way the issue can be entered into the pipeline for someone at Epic to reproduce this and enter an internal bug report. (So be sure to enter clear and thorough steps to reproduce this)