Recently I've been recommending Invictus to people with various degree of interest in crypto.
The point is for those who don't care about ETH, fees, blockchain, etc. not to be exposed to it. They could lock their funds, change auto-renew lock or claim and sell ICAP through Invictus without paying fees.
This wallet should not get voting power. Voting will be on-chain and while Invictus could theoretically make one Yes and one No transaction on all custodial users behalf, it would require trust that Invictus is voting faithfully.