I think the question is whether RH is sticky, they have good traction in growth, and I think it will be sticky. If enough people are doing fractional shares trading it's really hard to transfer out fractional shares to different brokers. Might actually not be possible.
Right so you have to purchase your fractional shares on your next platform, which I guess would only amount to the fractions so maybe not a huge deal if you have 100.5 of a stock you're only losing the .5, but it could add up if you have a really diverse portfolio.