They don’t allow it in their TOS or App Store guidelines?

Desktop Safari supports bookmark (& reading list) export via an HTML file on the off chance you’re not aware, and it isn’t banned.

We might be talking about different things: one off export is possible like you mentioned but no way to sync saved links to the reading list continuously as there’re no API’s for that from Apple

On Desktop Safari the reading list is stored in a Bookmarks plist file you can grab and filter out Reading List items from, might be worth having some little desktop util for a 1 time sync to move people onto your platform? It's not ideal, but it's better than nothing.

Here is an example with some code showing how someone did it so they could upload it to Pinboard: https://brettterpstra.com/2015/01/06/reading-list-catcher/

Ah, could be good actually. Definitely better than nothing, thanks for finding that link, appreciate it

No problem - and congrats on the launch!

Thank you!