Great question! We currently only have our swap service on Hive and Hive Engine, since our wallet only serves Hive at the moment. The problem is that is the liquidity is very small, we make a few hundred HBDs, up to a thousand (rare), on a good month.
One of the advantages of having Keychain become multichain is that we will then be able to provide access to many more chains and tokens, as well as some types of services that simply do not exist on Hive. Take on/off ramps for example. You'd be able to buy or sell HIVE or HBD directly from Keychain, with only one intermediary step to convert it into an EVM token. We don't offer this for now as no provider currently provides a direct HIVE on/off ramp.
EDIT: As briefly mentioned in the commitment section, we will prepare a public page to keep our earnings transparent once everything is ready on the EVM side.
My guess is that since Hive Keychain already supports Hive-Engine they probably would support MAGI. Whether or not Hive Keychain would continue the support after @lasseehlers drives most of the users away from that ecosystem with his toxic as Hell "crypto expert" LARPing is harder to predict.
But at least peakd.com already has the barebones for a MAGI wallet.
Actually, we already developed Magi integration long ago (it was still VSC at the time). We will release it when there's enough demand for it.