Yes Gentarium is now the biggest masternode platform in crypto however I would like to see the team clean out the old dead masternode projects as I see there is a lot on their platform. Then we'll get an idea on how many actual alive masternode projects are hosted.
Cleaning up all dead masternodes on Gentarium platform is the same as what exchanges usually do with dead projects. So , I support your proposal. However, another thing might occur with Gentarium team arbitrarily do it suddenly. They have to announce and allow their customers around one month to move their masternodes to their wallets or somewhere else; and should have public excluding criteria of masternodes hosted on their platform.