Yeah, RH could legitimately be trying to protect their users from what is basically a pump & dump scheme. Alternatively, they could be having liquidity troubles, or backend trouble, etc. If you are serious about trading you should not be on RH...
Considering that RH's business model has benefited from getting people excited about gambling on volatile stocks, I highly doubt they would be motivated to protect their customers from pump & dump.
While basically true, this isn't a reasonable excuse to shift blame from RH to their users.