I have made something similar couple of years ago, but I took down the video that I recorded doing it cause I was afraid it could turn back on me.

These days I usually try to write an email to the abusar and to the hosting services. I also did a bunch of this "flags" on Instagram ads.

Instagram is the worst, cause they open a website in their app, hiding the true URL of the phishing site. I sent a complain to them about that. Never heard back.