Easiest to check out the list of companies sponsoring OpenTofu
https://opentofu.org/supporters/
For more details, you could listen to:
A list of companies sponsoring OpenTofu confirms that TF was "losing" to tools like TerraGrunt and SpaceLift? Sorry I don't follow.
Don't have any data I must say, just a series of discussions here and elsewhere over the years, voicing either appreciation for the platforms above or displeasure with the logistics/price of TFcloud, e.g. with one I remember
https://old.reddit.com/r/devops/comments/eaq8bh/terraform_em...
The vast majority of projects that I've come across at work just had the tf CLI wrapped in a CI/CD pipeline + some bucket, but the managed competitors seemed to come up more often (compared to other tools/platforms) when people wanted to use/were using something as a service. Perhaps it's really just a perception thing, I never checked their financials
edit: I think I went off-track from the point. The point was that the ones selling managed versions were not the hyperscalers, but people building wrappers and similar around it. The other commenter with the list of fork-backers illustrates that nicely.
Would love some data in support of this statement. Not saying you're wrong necessarily, just it feels like a perception vs. reality comment potentially.