I think it is mostly because dev.to is still relatively young. Most of the active members want to to support the idea of dev.to, which is having an inclusive and accessible community.
Maybe as it keeps growing it might get the same problems. However, as long as toxic communities have homes elsewhere they are less inclined to move to a new place.
But I think size and platform scope is a major factor. For example, if dev.to would expand to include topics like religion or politics there is a fair chance that toxicity increases.
You only need 1 broken window which left unattended can bring the whole thing down.
Very good point - here's hoping we keep the focus
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