Thanks, so my rewards are accrued regardless of my registration?
Yes.
In what form are the rewards ? Is it any Spectre.ai tokens or maybe ETH ?
ETH only. But you need to use Metamask, Trezor and Ledger and recently they were facing problems with Ledger so better to use Metamask. I asked about other online wallets and they said they would enable more options like myetherwallet.
BTW I wish I hasn't noticed that price of SXDT was almost two times higher than now - maybe I would sell and buy back now ;>
Currently, the market is bad and hence selling tokens would not be a good idea. Holding would be better as currently the price is 25 cents while earlier it was as high as $2.