The landscape is changing. As cars become more secure (ECUs with RSA encryption, like Bosch MG1 and MED17), the ability to flash random free files is diminishing. Manufacturers are moving toward "Sentry" mode and locked bootloaders.
You cannot simply plug a USB cable into your car and upload a file. To use a database, you need specific hardware to communicate with the ECU. ecu tuning files database free
If you find a compatible file in the database, you are essentially copying someone else's map changes. The landscape is changing