There's plenty of semi-technical tinkerers out there, doing things like building flight sim cockpits, scraping by on copying ready made code, doing minimal changes and asking forums or LLMs if they get stuck.

They just want something that works, and ideally to keep using the same thing they've always used. They know what Arduino is, as long as it does the job they aren't interested in researching alternatives. They don't want to get involved in adapting someone's instructions for a different pin layout, or risk that anything they've done up to now stops working.

Yes, we all know it's a massively out of date platform easily outclassed by much cheaper and more flexible solutions, and if you must use the Arduino IDE it can build code for all sorts of boards. But for non-technical people by far the most important factor is to stick with something safe and known.