Closing tax loopholes used by companies like Amazon, Apple, Facebook and Google. While the specifics haven't been nailed down, it would involve a "two-pillar" approach that both divides the rights to tax companies where products are sold (not just where they have offices) and a minimum tax rate.
https://www.engadget.com/2019/06/09/g20-to-close-tax-loopholes-for-tech/
https://www.engadget.com/2019/06/09/g20-to-close-tax-loopholes-for-tech/