It's not a direct cause, but if an IP is hitting my website with spam, I don't care if it's a spam bot or a CGNAT exit point. The only way to stop the spam is to take action against the IP address. For CGNAT customers, that means extra CAPTCHAs or worse.

You can ask your ISP for your own IPv6 subnet if you don't want to be lumped in with the people whose computers and phones are part of a scraping/spamming botnet.