Global Foundries are setting the CPO gold standard.
They released SCALE optical module, the first platform exceeding the optical golden standards requirements, set by companies like $AMD and such.
In english: their fab capacities are proven the best to manufacture state of the art CPO plug and play.
The market continues to mistake TSEM as the #1 SiPho fab and rewarded its stock as such.
The real #1 is Global Foundries.