Tesco's - one of the UK's largest supermarkets - came out a few months ago and said "We've migrated off VMWare because of the licensing". They did it in months. On the major backends running every store in the country.
They had a massive dispute with VMWare and are suing them (they say they bought a perpetual licence, VMWare then cut them off), but while they did that... they just migrated their ENTIRE infrastructure.
Sure, it's a big thing to do. But it's not impossible, doesn't take years and - like Tesco - you don't need to wait to do it. If it's THAT business-critical? All the more reason to have an alternative ready to move to at a moment's notice.
Companies CHOOSE to get tied in, they CHOOSE to only ever run one system, they CHOOSE to make the migration painful, they CHOOSE to hold back on it in the hopes they can negotiate to carry on just as they are. And those are all DUMB from a business-continuity point of view and no substantial organisation should be allowing that to happen.
Pretending that huge organisations paying Broadcom millions are somehow powerless in this is actual complicity in the worthless side of IT where everything is just absent of any redundancy, resiliency, independence, failover, etc. etc. etc.