No modern social media platform makes user emails available to the public. You could although write a crawler to crawl through all the pages in a certain subredit and collect emails that were included in comments.
CPU mining will not get you very far.... another thing to consider is how is the liquidity on Monero? suppose we could actually mine a substantial amount of coins would we find enough buys to sell it back to?
This won't solve the problem. There is no provision anywhere in that code for detecting adblock. This will work for showing an image hidden behind another image(ad).
In this case it is the adblock that removes the ad. What the OP wants is to remove the iframe(video) if an ad is blocked.
You could make a newsletter touching on the similar subject, as to what the previous owner was selling. Since they bought that websites products you have a slight idea of what they are interested in. Ask thel to opt in of course, and then put some ads on your newsletter to monetize it.
The best and cheapest solution for sending mass email is Amazon SES (1$ for 10K emails, yes one dollar for ten thousand emails).
Hosting your own smtp server is more of a headache than anything, as aside from the technical aspects (which are very complex) you will be spending most of your...
It is a way that youtube can check that you uploaded videos that are legitimately your own content, and not just downloaded from another youtube channel and re-uploaded. MD5 is like a finger print every file has a unique one.