Those can not be compared that easily. There are many changes you can do easily. Changing data retention periods impacts guarantees customers may have given in compliance to privacy regulation like GDPR, HIPAA etc. and thus is a substantial change to the customers in areas with such regulation.
But if they make an exception for one person, they're opening the doors to complaints and possibly even legal action from others who want the same change. So making an exception for one person isn't really making an exception for just one person. Instead, it's a large process that needs careful legal consideration.
An exception for a single client might fly for a small company, but it's not really a _simple_ exception when you're a large company (like Saleforce). It needs careful legal consideration and possibly means changing the general T&C for everyone.