What do you mean by change of strategy?
All three of them have solid reasons to cut the middleman and create their own NAND.
There aren't any non hand waving reason for those three to do this. The "solid reasons" here are a vast mirage.
1. there is no "middle man". Toshiba direct sales to Apple/Google/Amazon involves no middle man. Those three have contractors that actually make stuff for them but that isn't the "middle" of the transaction for Flash that is a different, assembly, function.
2. None of these three fab any of the other components of a cloud server so this relatively limited subsystem doesn't really do much of anything at all. [ Fabs are very high capital intensive items.... none of these 3 are committed to that level. The data centers aren't really at the same levels now or going forward. ]
Amazon and Google operate a lot of cloud infrastructure.
running cloud infrastructure ( a bunch systems that consist of parts assembled from semiconductor providers ) is a substantively different business than being a semiconductor fabricator.
Far more likely these bids are signals to others who want to be in semi-fab industry that these companies might "loan" some money (e.g., pre-pay or straight out loan) to have privileged access to production. It is a way of 'talking' to all of the bidders at once without really talking (potential anti-trust trouble. )
P.S. the other more probable factor here is that Apple/Google/Amazon are trying to push the price higher so Toshiba will actually sell. If some of these other fab offering companies low-ball too low then their might be no sale. Again this is far more "grease the wheels of the sale" than wanting to actually own it long term. The offer to buy gets increased access to Toshiba's books and other information around the deal. So bid to buy in so that can play a role in the decision.
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