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Automatically delete new accounts that have not verified their email within 24h.

Automatically delete verified accounts that have not made a purchase in the first month.

Automatically delete accounts that have not generated a "lead" in the first year.

Replace "lead" with whatever makes sense for your system.

Also maybe put Cloudflare WAF on your signup flow and set it to a high security level.

If you make it too difficult to signup ... no-one will. If you make it too easy, you get a lot of useless signups. Don't make people sign-up to get basic info. Recently noticed a customer-site had the 'sign-in-with-google' popup. Accidentally mis-clicked the close button, 1 minute later: "Thanks for signing up". And off-course, no way to delete my account.

Here's a uBlock filter to defeat 'sign-in-with-google' auto-popups

||accounts.google.com/gsi/*$xhr,script,3p

Does this visually block the text+images from showing up, or does it block the network request altogether?

That filter blocks the request outright. A cosmetic filter would have a CSS selector in it after a couple of # signs, and would apply to the site containing the popup.

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