If you have transferred funds to Coinbase and bought a Bitcoin, Coinbase owes you 1 BTC. That is your claim against them. Nothing else. They do not own you Cla

If you have transferred funds to Coinbase and bought a Bitcoin, Coinbase owes you 1 BTC. That is your claim against them. Nothing else. They do not own you Clams or Stellars or Byteball or any other token that you did not buy. Keep in mind that this is the fourth coin to be initally distributed to the Bitcoin UTXO set this year alone. If anything, supporting one but not the other would increase their risk exposure, legally as well as support wise. Every token carries risk.