Using the website means the photos are backed up in the cloud which is precisely what they don't want. And in the first place, you shouldn't have to use an ad blocker to turn off something that you should be able to turn off with a setting.

Also huge disagree on websites having better UX than native apps; it may be true more often on PC, and it may also be true on mobile for some apps that are particularly bad, but otherwise I observe the exact opposite of what you're saying.