It heavily dampens the feedback loops which lead to new contributors joining. If more people feel encouraged to just let an LLM hack something for them then fewer things are learned by fewer people, less knowledge is developed and propagated, etc...

And more of that which was shared is worse because there's no quality control in those sharing pipelines, and ironically more ego behind it when the sharer has done less (see: that person in the group project who did nothing useful and took all credit)