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I applied for an analytics position that unexpectedly had me take a Python coding test like this (I know a bit of PHP and Java but no Python) and I was able to google everything I needed to pass the test in the time limit. Apparently I got one of the higher scores too. Got the job. It has not required me to write a single line of Python, lol.

I see no way of controlling privacy in a decentralized system. It'd be like trying to delete all the emails you've sent to other people or stop someone from forwarding an email. Once you put the data out there in a decentralized system, it's out there permanently. Centralization allows for some control.

Not just online activity. Bank/credit card transactions. Utility/tax information. Postal information. Subscriptions to anything. DMV records. A detailed profile of you is for sale to anyone who cares to pay. Probably less detailed than most people, since you're careful, but enough to be spooky.

They buy the info from massive data brokers, who buy data from other large and small data brokers, who buy the data from app makers, services, etc. User123@gmail.com expressed interest in buying kitty litter isn't exactly sensitive information so there's probably not much in the way of auditable logs maintained, probably impossible to determine the original provenance of the data in many cases.

Gotta love using trendy non-ACID databases for financial transactions and suddenly rediscovering why ACID databases were invented.

Main use of HSR is going to be getting to and from peripheral cities. Fresno to SF and Bakersfield to LA in under an hour would be HUGE. That's going to get used more than the full SF to LA trip.

Rent in an area is generally considered excessive when it's more than a third of the average income. And it also has to cover taxes, maintenance, etc. This is assuming you own them free and clear with no mortgage. If you finance buying a small rental property you're usually losing money each month for a few years until rents go up enough to cover your costs.