Add Origin via IP address Tracking
Comment section on YAHOO has been overwhelmed for some time by trolls, bots, & bad actors. I am NOT suggest you moderate or censor your platform more. However, you COULD let your users make intelligent assessments regarding what they are seeing.
A simple addendum to users' icon or name - flagging country of origin and/or VPN usage by tracking IP addresses.This would be a quick and relatively easy 'fix'.
Per the TOS everyone accepts without reading, YAHOO does collect and track IP addresses. You just need to make it transparent to the users.

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Yab Low commented
Why are you censoring by deleting my posts of warnings to people about spambots that appear to be sanctioned by yahoo? “Claire” is the latest. I report them to you and your way of thanking me is to delete my posts.
Or is YAHOO the spambots?
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Yab Low commented
What is with all the 1 post copy and paste stories with links to malware sites? 1 post and over 100 likes in just a minute or two.
Now you have deleted and blocked me from posting to your spambots.
By the way - you still have me blocked and censored on my very old ID. What’s with that?