Vlad Thinking about Kagi-the-product, I think this could be a good area to explore.
However, I'm a bookmark power user: I need archiving, mobile, tagging, searching, etc.
The real divider for me is archiving: if you try to go into the Pocket territory (being a tool with tagged bookmarks), I think would be feasible for Kagi, and maybe we can stay with the current monthly fee.
Instead, if you're thinking to go deep and offer features like Raindrop (archiving, full text search, a mobile app, highlighting, sharing), you've to calculate the right fee (I think that the annual Raindrop fee is not only fair but also quite optimized being specialized, IMHO)
In my opinion try this would be a winning move for us all: this could tightly integrate result search and bookmarks, and who don't want that? However, for power user like me, I'd need a strong offer on Kagi side to migrate from Raindrop.