Amid Amazon's (AMZN) - Get Report move into the grocery space with Whole Foods, TheStreet's founder and Action Alerts PLUS portfolio manager Jim Cramer said many companies are pulling back and reassessing whether or not to use Amazon Web Services.

Cramer pointed to Target's (TGT) - Get Report decision to scale back use of Amazon Web Services following Amazon's Whole Foods deal.

"The long knives are out for Amazon," Cramer said.

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Amazon's rivals in the cloud space include Microsoft (MSFT) - Get Report and Alphabet's Google (GOOGL) - Get Report . Former Apple (AAPL) - Get Report CEO John Sculley told TheStreet in an interview AWS could be worth more than $100 billion. 

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