I'd say go where your users hang out. For me it was LinkedIn and reddit. Don't spend money on ads, it's simply not worth it at the beginning. Cold outreach works, the not so secret is that the message should be appealing. If you get bored reading your own outreach message, there's a high chance your audience will be too and you'll end up in spam as fast as I eat a chocolate tablet.
Now that's a fantastic piece of content. I have a Tually just launched a Claude wrapper that provides a voice interface to Claude. Definitely not as good as sesame so I'd dive again into your article to better understand how you got there, thank you so much for sharing!
Had the exact same thought some time ago now, even proposed it internally at my company. What makes me doubt this will work eventually is that scraping has been going on forever now and yet no standard has been accepted (as you noted robots.txt serves a different purpose, should have been called indexation.txt)