the short answer is GREED.... corporations are only interested in free. The global economy is changing and the FIAT world is starting to notice that crypto has benefits that far outweigh the short term volatility risk.
I totally disagree to the first part of your opinion (off course you are entitled to it). That is - "the short answer is GREED.... corporations are only interested in profits".
Greed as you submitted, I don't concur is the exact reason for the use of bitcoin by big corporations. Companies are suppose to generate money to run their businesses and so if they accept or use bitcoin to achieve their objectives, is still in line.
Then for profit making , not all are for profit. There are different types of companies. Basically two types which are the statutory - they are government establishment formed by the constitution and their soul aim is not to make profit but to provide social amenities as reaching out to government objectives to the citizenry.
And, registered company. Registered companies are further divided into:
1. Private limited liability by shares
2. Public limited liability by shares and
3. Company limited by guarantee.
These companies are all registered, the first two are geared towards profit taking while the third is incorporated for charity, research purposes etc.
In other words, I am just disabusing your mind and convincing you that not all companies run just for profit purposes and moreover , they are checked by the government as they are also to carry out some social responsibility to communities they are located.
Finally , you so much correct on the last end of your post. Bitcoin is a part of the modern world, with all its advantages. It will off course be easier for big corporations to adopt or accept it for faster business transactions.