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Objectively, dial-up.
Otoh, what I would really badly like to become a thing again is actual media ownership, ie. not having streaming services randomly yank your stuff away from you.
Also, I would nominate the fact that the 'It's obsolete as soon as you get it in the door' meme hasn't been valid for decades now, but hardware manufacturers, Windows itself, and the game industry are trying really hard to make that a thing again seemingly.
Yup! Spotify removing things off my playlists was a big initial factor into me getting into self hosting. All my music streams through Plex now and I haven't looked back
Even DRM-free storefronts like 7Digital for music or GOG for games aren't immune to random delistings.
For music, I've pulled it into my self hosted Plex setup, so even if the original sources like Bandcamp die, I am hosting my own copy.
Games are their own beast. Hard to do similar self hosted concepts when there are servers involved, other players, etc. I'm still 100% on the "streaming services" for games.