Don't know how applicable they were for Satellaview (apart from the already mentioned downloadable games - the Zelda 1 remake wasn't one or so Nintendo claims in the loading audio, though), but the "backup" industry wasn't rare even back then - just expensive and inconvenient (obscure Chinese/HK/Taiwanese products, not made or sold by the 10 thousands, using floppies/reprogrammable cards/computers for storage)
The DS/Lite, out of all the consoles needing some hardware for copied games, had slot-1 flashcards going for very cheap due to both competition and being relatively simple designs for their years - even the PS1 took some years between launch, modchips, and very cheap modchips
To add to what Ryccardo said, the whole cheap piracy scene basically started with the DS and the cheapo R4 clones.
Before that, modchips where expensive and not sold in huge quantities.
Social media also has added a lot to it.
Due to the ease of social media, people came in contact with more pirates.
Not to mention people mentioning on facebook etc that they had a hacked Wii and are helping others hacking theirs for piracy.