No, it shouldn't go away, once connected to uphold all your earned tokens should be moved over, at least that was for me because I didn't use uphold in the beginning because I didn't want to KYC for 4$ but then it started stacking up so I thought fuckit.

Not sure, if they changed it since then

Yeah I don't like it either but it wouldn't be economical to run on-chain wallets with the current gas price so custodial we have to be. I guess they can always bridge with BSC or let it run on a side chain like MATIC but that makes it even more complicated and I don't think this is really the core focus of their business

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