Hey, was reading through all of this b/c I'm an existing investor and really bullish on this project. Just thought I'd let you know, as someone that works in media, that using stock photos for product mockups is pretty standard and not illegal at all; there are entire websites dedicated to providing device mockups to feature websites and applications so that those owners don't have to spend thousands of dollars doing photo shoots every week. 
I am aware that it is not illegal from the perspective of copyright itself, yes, just like how Aquaman poster used a stockphoto of the sharks (and the fallback of it were still existing up to this day) as I am aware that the "plagiarized" pictures fall under a free to use license for commercial and personal use (yes, I do my DD seriously), which is why I didn't bring this matter to the scam accusation board. If they plagiarized an original and copyrighted content, we'll be replying each other on the scam accusation board right now, as this forum heavily frowned upon stolen content.
But from the perspective of professionalism? Especially as they hired a design team? I know a lot of projects, both crypto and fiat, with small budgets, and they still hired photographer, videographer, and content maker to work and produce original content. Compared to a world renowned project in healthcare section, licensed and registered, worth (probably) million of dollars? If they prefer to go with "hey, it's legal to use a free template and we'll keep using them instead of hiring content creator to take real pictures in our partner's hospital" then it's up to them. Just, maybe you need to know, that investors of crypto projects (and probably a lot of fiat projects) uses pictures as a physical evidences and would automatically assumed those pictures were a real pic taken on-site. So if they find that the pictures were taken from free template then they began questioning the legitimacy and professionalism of the project they're about to invest, I'll suggest to blame the content creator who were hired and yet still too lazy to create their own content.
I don’t know how to better explain it to you that this is standard practice in all marketing and advertising, big and small, and has been for decades. If you think a startup business should spend the bulk of its capital hiring photographers and models instead of developers to actually work on the product then I’m not sure how to reason with you on this.
As an investor, I am not worried one little bit about them using licensed stock photos to promote the project and increase awareness. I think you need to get un-stuck from this simple thing and see the bigger picture here: the team has developed a working product that connects the entire global healthcare community in ways it never has been before, providing seamless and secure communication between practitioners that can improve healthcare outcomes. They can use cartoons to tell me about it for all I care. I believe in the project and am excited for what comes next!