3rd Party Electric bags, why so few?

Does anyone have theories why so few 3rd party bags are available for the Brompton Electric?

Besides the official three from Brompton:

• Essentials (comes with the bike)
• City bag
• Basket

There is:

• Lumabag Rucksack
• Valeria's Zip Cover Shopping Bag
• Valeria's Funtastik Office Bag
• Valeria's Valentina Backpack

(Did I forget any?)

That's a painfully small selection. The latch mechanism is different but it's not that complicated, and Lumabag and Valeria have proven you can design a bag that incorporates the existing frame. Why ignore a market that's proven it will shell out cash? 🤑💸