This hasn't been my experience. After another VC-backed software switched licenses, we continued using an older, open source version licensed Apache 2. But that didn't stop their lawyers from trying to shake us down, claiming we were using the latest, enterprise version. We just showed up in their telemetry as using their product and they came a knockin. I imagine that their telemetry failed to distinguish who was running old FOSS from the latest proprietary one.

We showed our lawyers that we were using the FOSS version. But, they didn't care and demanded we remove their product (despite being FOSS) immediately on all our systems.

That was a crazy crazy week.

You can say that's a problem with our lawyers. But still, who wants to go to court even if you know that you'll win eventually? It's expensive and incredibly annoying as an engineer to have to deal with lawyers.