Micron and Samsung do foundry work too. AMD was using GF as a foundry but when the product failed they went to TSMC to get the job done (I am pretty sure this is public information). Yes, I am highly aware of how foundries work and also know where the products are going. Samsung does foundry work for Intel! Really funny environment, like Ford designing engines and then buying them from GM or something. If you read articles closely enough, market reports and some other public information you can glean some information about who these foundries are producing for. Samsung really tries to keep everything they make in-house, I think this has more to do with Korean nationalism and protectionism than actual concerns over quality or profit. You open up a Samsung device and it is full of Samsung chips.
Trying to be careful what I say here... but GF went all in on 7nm, guess what...it's hard. It is REALLY HARD...they have tossed in the 7nm towel and are going to use their capitol equipment to milk some 14nm nodes to try to recoup their losses. This might buy them some short time profits and might make their IPO look attractive. If TSMC, Intel, Micron, Samsung and Hynix continue down the 7nm and even 5nm road then GF will just be another PowerChip and Rexchip building old technology at a tiny profit margin. China/Taiwan is full of companies that can crank out old technology, I don't think GF is in a great space to compete with those guys. This chip shortage will end, it will end in a big way overnight. Just like when Toshiba announced that they overbuilt and undersold memory back in the late 90s and again in the mid-2000s. Memory prices dropped by 70% or more overnight. Back then the Korean government even got busted for buying up memory from LG (Hynix) and sticking it into storage containers.
Just trying to add some reality - like Tesla, I wish GF the best, they are buying up more capacity at other (not Malta) locations and I would love to see the US Semi market be a contender (even if it is a foreign held company).