In episode 5 of the final season of “Succession,” Lukas Mattson (Alexander Skarsgård), the tech billionaire CEO of GoJo streaming, invites the Waystar Royco crew to Norway to see if the state of the company post-Logan’s death is something he can still invest in. Tom tasks Greg with getting to know Mattson and what makes him tick. However, in the wake of Logan’s death, Tom’s position of power in the company is in question, which makes Greg wonder if continually sucking up to Tom is still an advantageous strategy. Greg starts withholding from Tom, and introduces himself to Mattson next to Kendall (Jeremy Strong), Roman (Kieran Culkin), and Shiv (Sarah Snook), as a Roy family member himself.
As seen by their active annoyance, it’s obvious to his cousins why Greg is suddenly trying to portray himself as one of their own, and why Greg robotically tried to connect with them at the estate. With no inheritance or security to fall back on, maintaining his relationship with the Roy heirs is all he has to fall back on.
Despite his childish demeanor and sometimes incoherent speech patterns, Greg is not dumb as he looks — and if we look back on his behavior throughout the show, you can see that Greg is really just a monstrous product of the culture at Waystar Royco; the Roy family’s own creation. It’s an institution built on corruption and abuse, and Greg has shown us how someone who once had “principles” can become a perpetrator of that system.
Source : https://www.slashfilm.com/1265905/succession-season-4-episode-5-makes-clear-why-fans-have-turned-on-greg/