Blockchains aren't databases because they can't store any useful amount of data. It's just a publicly-verifiable, append-only list of very small data points. To do something as simple as "look up who owned vehicle X on Y date" you still need a relational database engine like PostgreSQL, MariaDB, MSSQL, etc. Unless of course your application involves people downloading the entire chain locally and running your software on their machine to look up vehicle history. That'd work I suppose, but good luck deploying it, and it's a lot more work than an actual database.
Even if all you needed was a blockchain (you don't) the suggestion that they're easier to setup and publish on the web for public access than an actual database is laughable. You can get Wordpress up & running in about 10 minutes complete with a database, webserver and human-friendly UI to access basic tools. The idea that you can setup anything blockchain-based to be accessible to non-technical people in less than 10 minutes is just nuts.
A blockchain provides zero value to solving this problem. It's more complicated, doesn't lend itself well to web-based deployments, can't store the data we need, and requires the consumption of more energy than necessary while slowing down the process of adding records and making them more expensive.