Senior leadership likely has an elastic workforce designed to contract (not renew contractors) and expand (hire contractors) based on market and business conditions.
I would worry only to the extent that you save money due to uncertainty. Anything else is outside of your control/concern.
If a 6-day old account making highly voted posts and no comments? Bot, part of a botnet (check who upvoted, and purge as neccesary).
6 month old account, combination of high and low effort comments? Does not emit hatred with every fibre of their being? Appears to understand debate? Rational human, trust.
You do it on case-by-case basis and slowly increase your trust network
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