Not necessarily. We don't know what all their costs are, but it's a lot more than just salaries. I'm sure there was a lot of uncertainty in how long those sponsorships would last. There are any number of factors. Adam also stated in a podcast [0] that he laid people of now in order to ensure they he could give them generous severance packages. I'm sure people will have thoughts on that but whatever, I think that makes sense.
[0] https://adams-morning-walk.transistor.fm/episodes/we-had-six...
What costs could tailwind the OSS project have besides payroll and SaaS subs of max 20% the payroll?