Under UC policy, employees agree to disclose to the university their development of patentable inventions and copyrightable software. Furthermore, UC can take an ownership interest in any resulting patent rights or software copyrights if the activity that led to the intellectual property: (a) was funded via the university, (b) used material university resources, or (c) is part of the scope of work of the university employee.
Your advising to startups is not likely to be funded via the university, or use material university resources. Nonetheless, if you develop inventions or software during your advisory activities, then it’s a good practice to confer with the OTL on your disclosure responsibilities and ownership assumptions.
Here are 2 good resources regarding UC intellectual property policies:
https://ipira.berkeley.edu/ip-protection
https://www.ucop.edu/research-policy-analysis-coordination/policies-guid...