Industrial IoT modules are solving these problems. I have been developing/deploying these modules for the past two years that interface to the controllers and send MQTT messages OTA to the cloud for analytics. Ofcourse, it is a bit of a challenge to interface to these legacy industrial systems, but not impossible.
Wasn't this how independent websites use to work before ad networks such as Google ads took over the internet? Problem with managing your own ads is that it would be very hard to get quality relevant ads if you have a small website, not to forget the overhead involved in maintaining ad space without a dedicated ad server.
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Thanks for a simple and easy onboarding process!