Sports car racing has always had problems to attract mainstream sponsors that are not part of a B2B deal as suppliers to a manufacturer.
If you look at most of the recent works efforts: Audi, Nissan, Toyota, Peugeot, Porsche, none of these have had any big time headline sponsors not directly connected to motor racing.
The last factory effort that had a proper branding sponsorship I can think of was Penske in the ALMS.
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