Side note: what did happen to Travis? I was just googling them yesterday because they were everywhere. They even came with the GitHub education package.
Damn. They were my introduction to CI/CD. Such is life
It wasn't a good business to be in anyway. I don't think any of these freebie devops businesses are all that smart. They're not a "business", they're a feature of someone else's business. And as soon as they catch up then you're done.
Also they’re surprisingly expensive: things like spam and cryptocurrency mean that you need a fairly large abuse prevention team which is expensive but has no customer-visible benefits. GitHub has that too but as you said they at least have the rest of the business with which to recoup that cost.
Travis was acquired a few years ago and things went downhill from there on.
Seems based on some of my research that they've completely exited the free side of the business. All of their plans are now paid and the cheapest plan is $64/year
I suspect GitHub actions put a massive dent in their product usage. I seem to remember they started to cut costs and restrict free usage some years back too, and that was the beginning of the end.