Except only harm people who come from search results to find a lone solution for a problem that's since been deleted.
This is the single best way to tell Reddit that what they did is wrong. Because the less random people find Reddit useful, the less they will go there. That means less webtraffic, and therefore less ad revenue and content to sell for Reddit.
It wouldn't matter. Deletes on reddit (and all social media sites) are soft deletes. The data is not actually deleted. They can still sell it even though it's in a "deleted" state, as they have a perpetual license to use anything you shared on their site in any way they see fit.
In addition, they are actively restoring deleted comments when people use any of the various reddit account wiping tools.