Probably not difficult for these competitor organizations to fund an OpenTF team to hire some of these people away from HashiCorp and continue it on as FOSS either. I can't imagine Liam turning down .5M/year to do so.
Marcin here, co-founder at Spacelift. We are open to fund 5 FTEs, feel free to reach out to us via the pledge page if you're interested in OpenTF becoming your full-time job.