I was expecting an experience closer to Tippin.me [1] where there's a click to tip, and another to confirm. Tippin.me, happens to be built on Bitcoin's Lightning Network so maybe Twitter will leverage Square's (also run by Jack Dorsey who's keen on Bitcoin) CashApp to do something similar in the future.
I could see the tip jar functionality go in the direction where a user deposits some amount of BTC to Twitter (opens up a LN channel with Twitter in the backend) and then a tap or click on the tip button results in a preset 100 sats tip.