Except there weren't really any mass harassment, rape and death threat, and firing campaigns being coordinated against ordinary people for not sufficiently mourning someone. Most of the "cancel culture" stuff was overblown nonsense, the few real events were against massive public figures credibly accused of heinous things like Weinstein.
Pretending this is in any way equivalent betrays either an intense naivete or a supporter of this pre-pogrom behavior.
I'm a bit late, but me and some friends I met over Reddit built a meme stock exchange in 2017. This was a game that would price meme stocks based on how much engagement some meme (or variants) were getting on social media in realtime. I built the analysis engine (including fuzzy reverse image matching, the social listening workers, and the pricing algorithm) and took the role of "CEO" pitching the technology to investors (there was a b2b marketing play there), organizing ourselves, etc.
It got me my first 6-figure job at a startup the next year, as we weren't able to raise funding or afford to continue running it. We also got a cease and desist from Nasdaq for our awesome name (Nasdanq). It also played a role in getting my current job, as it was a more refined version of the b2b play we were shooting for and the CEO loved the project.
There are (arguably) better ways to handle this, though. When you get enough cards, you won't conceivably review them all within a reasonable enough timespan to encounter concepts often enough to really remember.
The use case you mention is more suited to a personal knowledgebase with good search capabilities and/or networking, like Obsidian, Tana, Roam, org-mode, whatever. That way you have the knowledge somewhere, you can search it (of course, this can be lossy - like writing good cards this requires writing good notes), and you can build up all the context you need.
I think the article misses the mark on the dichotomy here - it's not search vs. flash cards, it's owning your knowledge vs. relying on external, potentially ephemeral sources. Flash cards and spaced repetition are great for certain use cases (Anki is incredibly popular among language learners for a reason), but not for all of them.
Pretending this is in any way equivalent betrays either an intense naivete or a supporter of this pre-pogrom behavior.