The move from these teo trusted sites is to protect those that are new to cryptoworld that are vulnerable to online scams using crypto to get money from innocent people. This is actually good for everyone. Not all people see the goodness in this act by facebook and google. If this gets implemented, people will only buy bitcoin in legit sellers and websites which means many people will now trust that they will not be scammed. The only reason why some people didnt invest earlier was because of fear of being scammed. If google and facebook will remove this vulnerablility then this will enhance the value of cryptocurrency and might bring the price back up.
Understanding the main positive effect would be from the fact that they have put on the ban on cryptocurrency but after some time passed they just removed it so people would think that they counted cryptocurrency as trusted and worthy.