The kind that give away their product for free, give the company to their wife, develop an in-house distributed version control (fossil (which is excellent)), give that away for free and encourage other version control projects to please steal ideas from fossil. drh (Richard Hipp) is an interesting duck.
Ones that have effectively 100% test coverage on their codebases, massive existing deployments, famous levels of documentation, and world expert level comprehension of their problem space.
SQLite is used for small and embedded systems, which (if successful) can have very long lifetimes. If you were building something like an ATM for instance, you would be very sensible to sign a 35-year support contract for a crucial part of your system.
Microsoft has nowhere near the quality, security and bug-fix track record, documentation coverage, nor testsuite coverage that SQLite offers. There's simply no way they can possibly provide such support.
There are products that Microsoft offers long support contracts for. To give an example, EOL for XP Embedded is in April 2019, which means XP in all its forms would've been supported for about 18 years.