Yep sorry for that. We introduced query limit to prevent abuse and control cost during (free) beta but initially set it very low for our target userbase (50 queries/day). We increased it since to 200/day after receiving similar feedback and of course once we launch there will be no limit.
Kagi Maps is still work in progress (beta like everything else) and we just didn't get to shipping this feature. We are not using OSM only though, and many users have complimented the map to be better than Google maps already (for features that we have shipped).
My other feature request is that I still like google maps, and OSM is just not a good replacement. The important feature for me here is: google a place name, click the map square that shows up in the Answer for that place to open it in gmaps. Both kagi and brave search use OSM which is not clickable, this really breaks my UX and alone is enough to make me want to go back to google search. Using !m sometimes seems to work but I think ideal would be a "which maps provider would you like" feature which just lets a user choose.