30,000 unrelated people had their data handed over to the government

It doesn't say it happened. It said Google received a court order. People challenge court orders sometimes, there's just a process you have to go through to do it.

The whole article is honestly just weird. E.g. "Privacy experts from multiple civil rights groups told Forbes they think the orders are unconstitutional because they threaten to turn innocent YouTube viewers into criminal suspects." That is... that's not what "unconstitutional" means at all. Sometimes cops will question innocent people or knock on doors when they're investigating crimes. If they're doing it without court oversight, that's dangerous. If "crimes" include things that aren't actually crimes, that's dangerous. If "knocking on doors" includes more than just actually asking questions to investigate, that's dangerous. But I'm a little doubtful that they showed up at anyone's door just because that person watched a YouTube video and started asking them questions related or unrelated to the specific crime they were investigating.

The article's written in a way where you genuinely can't tell some important details -- they don't say whether the video was public or unlisted, they don't say whether the cops were the ones that uploaded it, there are important things like that that they don't make clear. But the idea that the constitution says the cops can't gather data under any circumstances to investigate a crime seems like just a knee-jerk "cops bad" reaction.

I don't even necessarily disagree with your broader point. If the cops took a publicly-listed YouTube video and asked a court for the identities of 30,000 people who happened to watch it, and then the court agreed, and then Google gave them the data instead of pushing back legally (which the article claims they do sometimes), then sure, that's wrong. But literally every one of those elements is unclear from the article whether it happened.

there's nothing stopping cops from getting all of our data

At the end of the article is an instance where the cops went to the court for a "geofencing" warrant and the court threw out their request because it was too broad. That's the point of oversight and why having to get a warrant is an important step.

Like I say I'm honestly not completely disagreeing with you here. I definitely think too much data gets harvested about what every person does online and the cops are too freely able to access it with too little oversight. Depending on the details, maybe that's what happened here, or maybe it was legit. I'm just saying I'm don't agree with the assertion that it's always wrong.