If you want to serve it up on your own server, I would assume you'll download the planet.osm file, render it and serve your tiles. So, the only way modifications to the tags would be a problem is if YOUR planet.osm file is publicly available. You don't have to automatically grab the new planet file every week, you could grab it every month, say, and then verify it before rendering it. If you see that things have changed and they don't make sense, edit them back to how they should be, and then render it. I don't really see the problem that makes OSM unusable for your application. The problem is starting out with known good data, and then only accepting updates that still seem good, or fixing the changes if they don't reflect reality.
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