I figure the Internet points were useful to a certain point. Some subreddits were set to have a karma threshold that you needed to exceed before you could post. On one hand, if you were a new user who just signed up because you wanted to ask for help on that community, not great, but it probably? went a long way to keeping out low-effort bots that would spam a self-promotional link or scam link.
At least in the niche communities I occupied, upvotes went to helpful solutions or interesting discussion points, while downvotes helped make sure that comments with nothing productive to say (for example, just "kill yourself" with nothing else included), random off-topic comments, and incorrect solutions were collapsed by default instead of clearly visible for everyone to see and get annoyed or misled by.
Once I passed most subreddits' karma thresholds I stopped caring about how much karma I had in total. But it was also nice to see how many people liked, upvoted my comments and posts that I put effort into. Discounting posting on free karma subs when I still had like 20 karma and wanted to actually be allowed to post in subs instead of autoremoved, I never really did anything with the motive of gaining internet points and it still feels surreal that enough people did for this to be a common complaint about Reddit and a "how do we prevent it" discussion topic on kbin.