This is pretty bad. That pretty much destroys the credibility of Reddit's commenting system in a single act. No one can look at the integrity of the comments written by others the same any more.
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But, usually a company of this size/scale puts in place restrictions so that accessing privileged abilities like this is extremely difficult and requires authorizations / clearances / permissions from users, etc.
Generally big / public tech company employees are not even allowed to LOOK at PII or the data of a specific user name etc. You run all tests on staging / fake populated DBs only, etc.