If you can get away with it, start out running multi-cloud
That seems like a pretty bad idea to me. You don't need to run multi-cloud at the start. Especially if you just use basic services like EC2 and S3 or something container-based, maybe a database service for something standard like Postgres, you can avoid getting locked in for quite a while. Early on, there's just so much to do, going "multi-cloud" is a waste of your limited time and energy.
That seems like a pretty bad idea to me. You don't need to run multi-cloud at the start. Especially if you just use basic services like EC2 and S3 or something container-based, maybe a database service for something standard like Postgres, you can avoid getting locked in for quite a while. Early on, there's just so much to do, going "multi-cloud" is a waste of your limited time and energy.