Saudis are invested in a huge range of things in America. It has historical roots in the petrodollar. The basic deal of it that that they would only sell their oil in USD, which gave the USD a de facto backing after we defaulted in Bretton Woods (which was a de jure gold backing). That gave the USD a huge chunk of stability and in exchange we agreed to sell them weapons and broadly support them, while in exchange they were also asked to purchase US treasuries and assets with surplus revenues.

Over time this led to Saudis being involved in just about everything. For instance the biggest owner of 'old Twitter' under Dorsey was Alwaleed bin Talal Al Saud. Needless to say the zeitgeist on old Twitter and Saudi Arabia have basically nothing in common, so you're probably seeing ideological motivation where the real motivation is generally just monetary. Not every country is conspiring to subvert other countries to their ideology.

Basically Saudia Arabia is filthy rich because of oil, but they fully understand that even if we continue burning oil until we run out, we will run out, within the lifetime of some people living today. So they have to migrate their economy away from oil and, on the timeline for such a revolutionary shift, they have very little time left. This is likely what MBS sees as what will define his legacy.