Axios

Twitter has reduced the maximum number of accounts a user can follow per day from 1,000 to 400, it said on Monday.

Why it matters: Spammers commonly follow hundreds of accounts in an attempt to get them to follow back and juice their follower count, often by writing software scripts that automate the behavior. Twitter is under pressure to limit the extent of fraud, but slowing down the bots won't eradicate the behavior.

While Google's AI ethics outreach efforts are mired in controversy, Microsoft has managed to engender significantly less animosity through a more systematic approach.

Driving the news: Google appointed a controversial outside advisory board, drew an onslaught of protest and disbanded the group a week later, succeeding only in antagonizing people of many different perspectives.

A new plan for regulations released by the U.K.. government Monday puts legal responsibility on tech companies for any harmful or unlawful content that appears on their properties. This means tech giants can face big fines if they don't remove things like terrorist videos or hate speech in a timely fashion.

Why it matters: If passed, the proposed laws would force tech companies to operate with much more rigor when policing content on their properties. While the law only extends to the treatment of content within the U.K., it could have major implications for how tech companies operate and are regulated globally.

Lyft has been a public company for just over a week now, during which its market capitalization has fluctuated between $30 billion (the high, just after the stock opened for trading on March 29) and $22 billion (the low, on Tuesday).

The big picture: Stock market investors can be forgiven for being unclear about how much Lyft is really worth. Lyft doesn't break out how much it's spending on discounts and incentives, for instance, and it doesn't disclose key metrics such as acquisition costs or churn rates, either for passengers or for drivers.

Saudi Aramco, the world's most profitable company, revealed this week that it had $224 billion of pre-tax earnings in 2018.

Details: Some of those earnings were paid to the Saudi royal family in taxes, while $111 billion was retained as profit for Aramco's sole shareholder, which is also the Saudi royal family. That kind of wealth helps to explain why Goldman Sachs CEO David Solomon found himself back in the kingdom this week, less than 6 months after he joined the rest of the world in publicly avoiding the country.