I mean, mainly because it could happen. If it's a slow day and you made something mediocre there's a decent chance you could get a daily. Hell when SoupSquad was around we worked out a formula for the slowest day of the week to increase our chances lol.
Who's to say some kid making something shitty shouldn't get a daily? Maybe they need that little boost in order to feel this is worth it. Maybe that recognition helps them find a collaborator or mentor. But they shouldn't just *expect* it to happen, increase your skills every time and it's sure to happen eventually.
EDIT: If you're asking why they play the nostalgia factor by trying to make mid 2000s style stuff, because it works. It's the same reason people make content relating to new video game releases etc, it's a hype factor. Nostalgia works as well as newness sometimes.