Can We Talk About Nu Holdings?

I know nothing about this company, beyond the fact that it is a digital banking platform, that's based in Brazil, and the fact that a couple of years ago, Warren Buffett bought 107 Million shares of it in 2021. It's up 60% in the last year, and it's revenue grew over 130%. I'd hesitate to say it, but is it a poor idea to invest based off the fact that Buffett believes in it?