Web Mining: is that bad?

Is web mining such a big problem for the user or is just the ad platforms fear about losing their power?
There has been a lot of noise around Monero and Coinhive lately, or web mining in general, and don’t quite agree with most of what I’m hearing. It all started with The Pirate Bay adding a web mining script to their site, so whenever you’d visit them, your CPU would be used to mine some Monero for them. That was made without any notice to the user, just “stealing” their power.

Hackers are quick to notice exposed Elasticsearch servers

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Coal Mining Emits More Super-Polluting Methane Than Venting and

The Good and the Bad of Apache Spark

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How to protect your computer from malicious cryptomining

PDF) Intent Mining for the Good, Bad, and Ugly Use of Social Web

Is Web Mining Still A Thing? - Crypto Briefing

Web mining and social media mining