The assurances I have come from several angles. The public statements from both Jim (our CEO), Ginny (IBM CEO) and Arvind (SVP Cloud Products @IBM). You can see those here: CEO: https://www.redhat.com/en/blog/jim-whitehurst-email-red-hatt... Arvind: https://www.redhat.com/en/blog/qa-ibms-landmark-acquisition-...
But I always put more trust in my own interactions and I've had an opportunity now to work with quite a few of my new colleagues in IBM on both the engineering and business side. What I have seen from them is humility and curiosity about our business - there has been no arrogance. This has been true of their words and their actions so far. To me this is important because I think it's as a result of arrogance on the part of the acquirer that many deals go bad post-close.