keep in mind that snopes also takes into consideration the
spirit of a claim when they give their up-front rating, rather than just the literal text of it. some claims are made to imply something greater, and they acknowledge that in addition to the surface-level content. with this in mind, i see no issue with any of the examples you provided (though the third one excludes the claim in question so it's hard to tell what's up with it).
a fair portion of snopes' fact-checking isn't actually political though, it's just debunking social media memes/myths or other weird stories that get passed around. and for every article they make, they go into detail about why they came to the conclusion they did, with sources for every bit of relevant information. and as you said, they do tend to edit articles as more information is brought up or as circumstances change. the up-front true/false measurement system they use can be a little confusing at times, so it's best to always check the contents and see
why the rating they gave is what it is. i've never once seen snopes point to false evidence for their evaluations or approach the situation using value statements rather than a transparent assessment of the facts they presented, and so i find the idea of overarching bias hard to accept. also, funnily enough,
snopes has a history of being called out for bias on all sides. it's hard to say why the right is especially skeptical at this point in time, but my guess would probably be that one of the most pertinent right-wing american politicians has a poor track record of falsifying information, or perhaps, their falsifications have been more greatly scrutinized in media than those of other politicians, and the use of snopes as an argumentative tool in these situations makes it appear as though snopes is excessively targeting right-wing figures, when in reality, this is likely not the case. if someone were to actually get some numbers on that though, that would be interesting to see.
i would probably bank the apparent bias right now more so on general media focus rather than snopes itself, tho. since people are focused so much more on right-wing rhetoric, it's only natural that stories and information in that area get passed around more, and since those stories are more relevant, obvs snopes is going to choose those other others. just a guess, but it's one that i think makes a lot of sense
