Subscription demand is category led and heavily mediated. The queries are best coffee subscription, monthly snack box, subscription boxes for teens, and most of the first page belongs to roundups, review sites and gift guides rather than to boxes themselves. Ranking for your own name is easy and adds almost nothing. The work is holding pages that can compete inside the category and being the box those roundups choose to include, which in practice means having public, indexable information about what ships and what it costs.
The page types that carry it are specific to this model. A past boxes archive, one page per shipment with the contents written out as text, builds a large body of product level content that ranks for the items inside and shows a hesitant buyer exactly what to expect. Gift landing pages sit apart from the subscribe page and target gifting queries directly, with an emailed or printable note as the conversion. A how it works page answers the billing questions people search for by adding cancel or pause to a brand name.
Technically the risks are an account area leaking into the index, a signup flow behind scripts that crawlers cannot read, and past box pages left thin because nobody wrote the contents down. Build the archive so each box is a real page, keep plan names and prices in readable text rather than inside a widget, and make sure the structured data on the plan pages agrees with what checkout actually charges.