1) We're not really talking "the average person", we're talking those of us already on Nostr and thus early adopters/more hardcore Bitcoiners. If hardcore Bitcoiners are cheering on custodial adoption and championing it, it will lead to less people even exploring/trying self-sovereign setups.
5) These companies are raising money from VCs and gaining fees from users that could otherwise go to self-sovereign setups, FOSS projects, and devs. It is a bit of a zero-sum game here - the more traction custodial wallets get, the less eyes, money, and devs go towards self-sovereign setups.
6) Why in the world are we happy that custodians (the "3rd parties" Satoshi *made Bitcoin to route around*) are the preferred onboarding method for new users? Onboarding someone to WoS doesn't even get them Bitcoin, nor does it even mean they will ever use Bitcoin. They are *entirely* at WoS mercy for custody, privacy, rug pulls, etc. I cannot, ever, get behind the stance that onboarding noobs to custodial wallets is the best thing and something to be cheered on. If we can't *actually onboard them to Bitcoin* why even do it?