@ScubaWithTurk , I'm not trying to be condescending nor looking for an argument, I just want to clear this misunderstanding up.
I believe this is the Indonesian law/regulation that you are referring to, which only relates to recreational diving TOURISM & SERVICES:
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Translated in English: RECREATIONAL DIVING TOURISM GUIDELINES BY THE GRACE OF GOD ALMIGHTY THE MINISTER OF TOURISM OF THE REPUBLIC OF INDONESIA,
The references to solo diving being prohibited are:
(IND) STANDAR OPERASIONAL PROSEDUR PENYELENGGARAAN WISATA SELAM REKREASI
(ENG) STANDARD OPERATIONAL PROCEDURES FOR RECREATIONAL DIVING TOURISM
(IND) B. Pengawasan Kegiatan Selam Rekreasi 1. Kegiatan Wisata selam rekreasi
(ENG)
B. Supervision of recreational diving activities 1. Recreational diving tourism activities
(IND) b) Seluruh kegiatan wisata selam rekreasi pada perairan terbuka wajib dilakukan pendampingan atau pengawasan oleh pemandu selam (dive guide) atau Instruktur dari pengusaha wisata selam baik langsung maupun tidak langsung.
(ENG)
b) All recreational dive tourism activities in open water must be assisted or supervised by dive guides or instructors from dive tourism entrepreneurs, either directly or indirectly.
(IND) 3. Wisatawan Selam
a) Wisatawan selam dilarang melakukan penyelaman sendiri.
(ENG)
3. Diving Tourists
a) Diving tourists are prohibited from diving alone.
(IND) e) Wisatawan selam yang akan melakukan kegiatan penyelaman free/skin diving atau snorkeling wajib didampingi minimum oleh seorang pemandu penyelaman bebas (free/skin diving) atau snorkeling dan dilakukan pada perairan terbuka yang relatif aman atau perairan tertutup.
(ENG)
e) Diving tourists who will carry out free/skin diving or snorkeling activities must be accompanied by a minimum of a free/skin diving or snorkeling guide and carried out in relatively safe open waters or closed waters.
@ScubaWithTurk do you see that by that very same section in those regulations for Diving Tourists including scuba, snorkeling and freediving are all bound by those same laws. Which would literally mean according to your interpretation of those Indonesian laws, that a couple on their honeymoon or solo traveller wouldn't be allowed to snorkel alone or without a guide at the beach.
I'm pointing this out, as all these regulations from the Indonesian government only apply to diving tourism and services. There's a big distinction from conducting one's own activities legally, like hiring mask, snorkel and fins and looking for turtles in Gili Islands from shore, as it's not an actual dive tourism service/business like a snorkeling tour, it's just hiring gear only.