Employer contributions to SS taxes are guaranteed by employment. Also other payroll taxes added on by states.
I don't know how available this is to folks who aren't Mennonite or Mennonite-adjacent, but it's there.
The mainstream Anglo-American attitude around this kind of support leaves me scratching my head a lot of the time.
--
0: Tithing can take many forms beyond giving cash. I tithed my RSUs.