MuleSoft has now grown to such a size that you can longer drive the broader business impact that you could before. The levels of management have substantially increased, and progression across the business for entry level positions is getting slower and slower. They may be able to offer short-term bumps in salary and title, but they cannot offer genuine and rapid progression in terms of responsibility.
MuleSoft is no longer a 'start-up'. While it's still a better growth environment than IBM or Oracle, if you are looking to wear many hats, build a broad base of skills and drive a massive impact, then this is no longer the place for you.
It was an open secret internally that MuleSoft are on the 60th percentile in terms of pay within the technology industry. In my mind, they do not have the brand equity or progression options to justify paying you less.