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the Ruby on Rails of Erlang, I guess. Maybe we just generalize the thesis to - the stack must be the ruby on rails of X language.

I'll give that and agree the underlying is a quibble.

Ramp is (mostly) a Flask monolith with some sprinkles of Elixir at the very edges where sub-second performance matters.

Ramp is mostly their Python monolith. They have a blog post about their use of Elixir for one service but it's really not their core stack.

Brex was a lot more all-in on Elixir, including being one of the languages "stars," but moved to a more conventional stack (IIRC Java/Drop wizard microservices with Kafka to talk between them).