>Anything safe from TLAs is what’s being sold only to them.

I think you're overestimating how much backdoors there are in products vs actual bugs. As we've seen with with recent vulnerability disclosures, there's plenty of bugs that were put there unintentionally.

We don't know how many of those bugs were intentional, or known, by the three letter agencies.

I didn’t make any mention of backdoors or bugs, intentional or accidental, or the prevalence of either. You aren’t wrong but you addressed a point I never made.

The point was that there are special products, implementations of already known algorithms, sold only to TLAs. They have the code validated to the Moon and back, unlike the commercial products.