I think it depends on how you do it. For instance, if you buy the domain just to redirect it with an affiliate link to the company site most will shut you down quick.
Also, now a lot of the domain parking companies won't let you target the keyword of the company whose typo you own.
I had a client that owned close to 400 of these typos using both scenarios and all of the domains were shut down with C&D letters.
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