Southeast Asia is the one market where treating marketplaces as optional would be dishonest. Product discovery here starts inside Shopee, Lazada and increasingly TikTok Shop rather than in a search engine, and a Singapore brand that stays off them is not protecting its margin, it is invisible to most of its regional buyers. So the question is never whether to be there. It is how much of your business is allowed to depend on a take rate that moves without asking you, and what you are doing to convert a platform buyer into a customer of your own.
The operational shape is per-country, and this is where most accounts we look at are quietly broken. Each platform runs national storefronts, and a Malaysian or Indonesian listing is a separate artefact with its own price, currency, stock pool, category tree and often its own language, not a geographic setting on the Singapore one. Cross-border programmes make it easy to start and easy to end up with the same SKU listed four times with drifting titles, inconsistent variant structures and reviews scattered so thinly that none of the listings ever ranks. We rebuild it as one catalogue with disciplined per-country outputs, so a change is made once and lands everywhere.
Then the margin arithmetic, which on these platforms has more moving parts than an Amazon P&L. Commission, transaction fees, the free-shipping programme you opted into, seller-funded voucher share, campaign participation costs and affiliate commission on TikTok Shop all come out before you see contribution — and several of them are elective, which means someone is choosing them, usually by accident. We model each SKU after all of it, decide which products can afford campaign participation and which are being sold at a loss to buy a rank, and set advertising targets from what is left rather than from a platform-reported return.