> Companies aren't altruistic, their only purpose is to provide value to shareholders.

Companies do whatever their owners tell them to do. What you are talking about one specific model of what some people think they should do and what purpose they should serve in society. A very popular and possibly even 'default' model, but only one of many.

https://blog.corplaw.ie/bid/317212/Shareholder-Stakeholder-T...

etc

that said, assuming altruism here even if there aren't immediately obvious benefits to the company would probably be a bit naive.