Sure there are. For example, I talk about a lot of it at PSA: Current and upcoming changes to Rewards and Creators
Soon won’t be. And there are official posts about it, such as NOTICE: Account Closures for Canada Uphold Users
Might also want to see things like replies to the other topics people have made. For example: Uphold No Longer Supported in Canada - #19 by Saoiray
Likely never. Brave is trying to push for self custody and move away from custodial accounts. But who knows what things will be like going forward. Nothing is off limits.