I once served as a PM for a startup in the observability space.
Monitoring is a brutal industry, as engineers love to build monitoring products. There is a long tail of hundreds of monitoring startups catering to every wim that are backed by only a small handful of engineers.
On the other hand, integrating a monitoring product into a company large enough to pay for the product is extraordinarily expensive. The DevOps team might want to have end-end visibility, but they can't add the library support required to make the deal work. Supporting one companies specific libraries is unlikely to pay off for other companies.
When it comes to distributed tracing, the value proposition depends on convincing every dev team in the company that this is the best solution for monitoring.
Larger companies have an easier time "cross-selling" these features, and can sometimes win deals by simply having the capability even if its never used.