5) is objectively false, CPMs were down on average during this time period, mostly due to lower demand because of COVID.
Facebook runs a VCG auction and is transparent around how payment works on their site, so there's not really any way for them to "raise prices" singlehandedly outside of this mechanism without being legally liable.
Facebook runs a VCG auction and is transparent around how payment works on their site, so there's not really any way for them to "raise prices" singlehandedly outside of this mechanism without being legally liable.