I don't think canva is considered or seen as an "Unprofessional". Everyone has it's own point of view but I think that it is Professional for professionals and Unprofessional for un-professionals, it's actually how we use it. I hope you got my point.
No, this is totally wrong statement. Who said Canva has ruined it's reputation? And again people may think according to their point of view but there's no such news about this.