What just happened? They both may be billionaires, but Elon Musk and Bill Gates are not best friends. The latest spat between the two is over Twitter’s acquisition of Twitter, which the former Microsoft boss warned could make the platform “worse.”

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According to CNBCGates spoke at the Wall Street Journal CEO summit on Wednesday about Musk’s takeover of Twitter. Much of what he said had to do with claims by the Tesla boss that he reduce moderation on the platform and adhere to the principles of free speech.

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But Gates has questioned Musk’s plan and his ultimate goal for Twitter. How does he feel about something? [on Twitter] that says “vaccines kill people” or that “is Bill Gates tracking people?” Gates asked. “What are his goals in how it ends? Does this fit with the idea that less extreme lies spread so quickly? [and] weird conspiracy theories? Does he share this goal or not?

Musk has spoken of his desire to make Twitter a free speech bastion by taking a more relaxed approach to moderating tweets, though it looks like the EU will have to to say something about making the site free for everyone. He also wants to get rid of the bot problem on the platform and the open source Twitter algorithm.

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However, Gates praised Musk. He called his time at the helm of Tesla and SpaceX “mind blowing” and said he did a good job bringing together great engineering teams at those companies.

“I’m a little doubtful that it will happen this time [at Twitter]but we have to be open-minded and never underestimate Elon,” Gates added.

Musk also talked about his ideas to make Twitter more profitable, including charging fees to embed tweets and having businesses and governments pay to use the service.

Musk confirmed last month that he confronted Gates about sale of Tesla shareswhich he followed with tweet mocking Gates’ appearance. This marked the final showdown between the pair after a public disagreement over COVID-19colonization of Mars and cryptocurrencies.