- if you provide an essentially identical service
- you make it seamless to switch
- and you incentivize users to switch
Then you may be able to aggressively siphon users from your target.
OP’s example is using a blockchain as the distribution mechanism for the incentives.
Lot of startups do this but have pretty high CaC. In the Sushi/Uniswap case, users were already crypto-native. In the twitter case, the majority of users are not. There's just going to be a bigger barrier than in the former case. Sure, I think if you spend money some people will switch, but it's much less clear to me how much money you'd need.