Yes, there are multiple competing providers - all the electricity comes from a single grid but competition in how you are billed for usage.
Many people choose a single fixed or variable rate tariff, but there are also off-peak tariffs that are very cheap at night but slightly more expensive in the day (designed for EV users), or even tariffs where the rate changes every 30 minutes depending on what is being generated - in this case when there is excess solar and wind generation then sometimes the rate even goes negative and you are paid to use the excess power.
It sounds like a combination of the Download Monitor plugin plus a misconfiguration at the web server level resulted in the file being publicly accessible at that URL when the developers thought it would remain private until deliberately published.
This comment reminded me to check whether https://www.distributed.net/ was still in existence. I hadn't thought about the site for probably two decades, I ran the client for this back in the late 1990s back when they were cracking RC5-64, but they still appear to be going as a platform that could be used for this kind of thing.
Many people choose a single fixed or variable rate tariff, but there are also off-peak tariffs that are very cheap at night but slightly more expensive in the day (designed for EV users), or even tariffs where the rate changes every 30 minutes depending on what is being generated - in this case when there is excess solar and wind generation then sometimes the rate even goes negative and you are paid to use the excess power.