It’s impossible to target all of them, yes. But that’s why BDS creates a targeted list of the worst offenders to concentrate consumer boycott pressure.

Currently the BDS list includes 8 targets, including HP, Sabra, Siemens, Puma, and Soda stream. https://bdsmovement.net/get-involved/what-to-boycott

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It worked for McDonald’s and Starbucks though. If you boycott the major ones it should have some impact.