It absolutely can be productive. So many people have done as you said and had the rug ripped out from under them by $ARBITRARY_PLATFORM_DECISION (cough cough Yo

It absolutely can be productive. So many people have done as you said and had the rug ripped out from under them by $ARBITRARY_PLATFORM_DECISION (cough cough YouTube) that if they had thought the risk they were taking on by going with one platform they might still be in business.