There are only a couple of possible scenarios here that I can think of:
1. Snowden is making a claim here that he suspects but doesn’t have proof of (I.e speculation).
2. He does have proof but isn’t willing to share it. Not with the public, not with investigators and for some reason he chose to never mention it internally beforehand.
3. He is intentionally making outlandish claims he knows are wrong.
I can’t see any universe where option 2 is likely. He is every possible motivation to do so if you go with his public story about why he did what he did.
I’m entirely open to options 1 and 3 however.
Also nobody is claiming that those incidents were anything other than abuse of the system. We are all in agreement on that. The question of is this more common than other threats they face from insiders such as spies for example is what we disagree on and so far I’ve not seen a single piece of compelling evidence to suggest it is.
Furthermore, I’ve explained how there are now new controls in place to prevent that from happening again and you don’t even have to ascribe any kind of altruistic motivation for it about protecting people’s privacy. You can entirely put it at the feet of they want to make sure they never have another Snowden incident again. This is why I’m saying that this just isn’t a realistic threat that people should be worrying about in 2024.
Beyond this Snowden's revelations were not about abuse within the domestic surveillance apparatuses, but about the existence of those apparatuses themselves. Prior to Snowden the idea that the government was engaging in widespread surveillance, of essentially everything, was still just a "conspiracy theory." The entire system itself is likely illegal, as it pisses all over the 4th amendment, but cannot be legally challenged because of a simple problem - for one to prove standing, to enable them to sue, they need to not only prove they were spied on, but also harmed by spying. Each time this is tried, the NSA simply claims national security and refuses to cooperate. So we have a likely illegal surveillance system with no legal means of challenging it.
So people trading sex pics, spying on lovers, or whatever - these are all instances of abuse within a system that should not even exist.