The specific details are determined at the state level, however the certification requirement is related to "accreditation" and applies to K-12 schools (universities and vocational schools are accreditable, but most instructors do not have state teaching certificates). Drawing on Washington state law, the state board of education informs us that "Accreditation is a voluntary process for granting public recognition to institutions that meet external standards of quality". The SBE is granted some powers regarding accreditation: per RCW 28A.305.130(5), "the state board of education shall"
Accredit, subject to such accreditation standards and procedures as
may be established by the state board of education, all private
schools that apply for accreditation, and approve, subject to the
provisions of RCW 28A.195.010, private schools carrying out a program
for any or all of the grades kindergarten through twelve. However, no
private school may be approved that operates a kindergarten program
only and no private school shall be placed upon the list of accredited
schools so long as secret societies are knowingly allowed to exist
among its students by school officials
The board's certification requirement enjoys some exceptions, under RCW 28A.195.010:
private schools should be subject only to those minimum state controls
necessary to insure the health and safety of all the students in the
state and to insure a sufficient basic education to meet usual
In exceptional cases, people of unusual competence but without
certification may teach students so long as a certified person
exercises general supervision
Teaching certificates enter the picture due to RCW 28A.410.025:
No person shall be accounted as a qualified teacher within the meaning
of the school law who is not the holder of a valid teacher's
certificate or permit issued by lawful authority of this state.
It's not that the requirements are waived, rather there simply are no certification requirements on programming bootcamp.