Because certain WP plugins have vulnerabilities which hackers can easily find and add malware to your website which google can then report as being a phishing site or malware, etc.
That's why its important to keep your plugins updated and your site secure.
I always update my plugins. But in this case I don't have any idea what problem my webhosting had - there were NO plugins that wanted to be updated (15 minutes before account deactivating) and for a long time - not a one! But after reactivating nearly all plugins wanted an update... It seems some of them don't like each other
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For now the problem is solved: there was a problem with WP plugins updates on my webhost, not with reports.
After they reactivated my webhosting account all phishing warnings disappear
^:)^
But it's very strange - what do plugins updates have with "phishing" to do???
Thanks, @s4nt0s.
I always update my plugins. But in this case I don't have any idea what problem my webhosting had - there were NO plugins that wanted to be updated (15 minutes before account deactivating) and for a long time - not a one! But after reactivating nearly all plugins wanted an update... It seems some of them don't like each other