What do you mean by colonialism? If industrial production/mining in lower wage countries is "colonialism" to you, then I strongly disagree, and so would most dictionaries.
Colonialism, to me, implies exerting direct political control over a territory (without allowing it democratic participation) and ressource/value extraction against the will of the local population.
Assembling phones in China/buying silicone in Brasil does neither.
Colonialism in Congo would be controlling the local government, administrating/allocating mining workers and extracting raw material against the will of the local population.
"Buying stuff from poor countries" is not colonialism.
Colonialism, to me, implies exerting direct political control over a territory (without allowing it democratic participation) and ressource/value extraction against the will of the local population.
Assembling phones in China/buying silicone in Brasil does neither.