Why? It was his own repo.
Like if he was spamming other peoples repos programmatically, then, yes, I would agree he should not expect sympathy from the rest of us.
Not gonna die on this hill though; seemed like a pointless and somewhat odd thing for OP to do lol
This is were we disagree, I report anyone who does this. Do not abuse github for marketing. It does not matter if it is your own repo, when you ping other people in it, they still get the notifications.
It's a work platform for developers, not a place to drum up leads for people trying to make a quick buck or as a means to reach out to potential users for whatever reason. This also applies to scraping emails and sending spam to inboxes.
If it continues or gets worse, GitHub will fade. I appreciate their efforts to tame the hype beast and slop peddlers