This is what happens when a single player (CDK Global) has massive market share (90% when measured by number of vehicles sold [0] --- EDIT: this is actually the combined market share of CDK + Reynolds, who have a non-compete agreement ---). The entire industry becomes fragile to product issues and/or malicious attacks. Anti-trust is important.
[0] https://casetext.com/case/loop-llc-v-cdk-global-llc-in-re-de...