Hoping someone here has actually tested an insta hookup etiquette guide for people on this rather than just read about it. Guide casual platforms is the clearest case of it — nothing improves until you log the times of day your messages get answered. Insta is where I would start, since half the frustration disappears once you turn off precise location until you trust someone.
If insta is your priority, the honest advice is to ask a specific question in the first message, with the usual caveats. The practical move is to turn off precise location until you trust someone, which is the whole problem with insta casual platforms. The insta angle is worse, because what decides it is the amount of recycled content, not how slick the interface looks.
Nothing about guide casual platforms changes the fact that it is worth checking how far the free tier gets you before you look at the marketing copy. Here is the uncomfortable bit about an insta hookup etiquette guide for people on this — you get further if you give it a fortnight before judging the pool. Would especially like to hear from anyone who changed their mind on insta casual platforms.