Strike is custodial solution. Not your keys, not your coins. The good thing about strike is they are encouraging you to withdraw to your own cold wallet.
I use it for DCA (dollar cost averaging) and not long ago they introduced a neat feature "auto withdrawals". When you reach certain amount (0.01₿ is minimum) the funds will be sent to your cold storage without fees.
nostr:nprofile1qqsvn0dkjt80raqrxd470c98n7zrdehmcvj6p5hgw3kyku6zyd8z0fqpg3mhxw309ahhsarjv3jhvctkxc685d35093rw7pkwf4xwdrww3a8z6ngv4jx6dtzx4ax5ut4d36kw6mwdpa8ydpkdeunyutzv9jzummwd9hkutce35yfw is from my view, the best Bitcoin purchasing app you can find if you're ok with KYC.
For me, KYC is not a biggie. I love airports 🪂 especially over water.