For a data point, they bought Baremetrics and immediately removed the cancel button (which itself is a Baremetrics feature!). Now you have to call them to cancel.
I guess that is exactly the kind of stuff you'd expect a SaaS PE firm to do, but it still feels a bit sleazy to me. IIRC the founder reported that from his perspective, they handled the purchase well though.
They probably have a checklist of best practices (depending on the interpretation of "best") they immediately apply to almost every SaaS they purchase.
Principal investor is a term of art in the industry. It has other financial meanings as well.
Principles are ideals you adhere to or uphold. They are also concepts used to implement a design. Principal and principle are homophones, and they are commonly mixed up.