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Digital ad company CEO endorses competitor that is also a digital ad company of rival digital ad company.

Twitter makes less than $3B/year on ads. Google makes $135B+.

Are they really competitors?

Yes, they are. Both have ads as their primary revenue stream. It does not matter if they are unequal in size, they still compete in the same space.

DuckDuckGo also makes money through ads.

Haha, took the words right out of my mouth.