The real reason innovation died is a complex and meandering sadness, but basically the business leaders prioritized head count and comfort over whatever it takes to lure creative, intelligent, academic, etc people into an industry and do non-linear things. I think there are similar parallels to computer architecture and operating systems, but these are a bit more widely approachable so there's still a small influx of academics and new companies.
This is not theft, but unauthorized use of the software.
Those successful in EDA seem to mostly be niche players doing one job a lot better than Big 3.
Tools for MMIC & RFIC design have become pretty advanced (specifically AWR).
>Synopsys and Cadence are the leaders of the pack.
Only by default and only through the inertia of lazy risk-averse management.
The CAD/EDA industry is a scourge.