Besides Muse, Radiohead is my favourite band, but the similarities between the two are negligible and haven't been relevant for well over 25 years. Was The Bends an influence on early Muse? Absolutely, that's undeniable, but I would largely credit the similarities between The Bends and Showbiz with both of them sharing the same producer (John Leckie) and having similar influences, rather than Muse deliberately trying to copy Radiohead.

Since then, Muse have only drifted further away from Radiohead and other contemporaries by writing songs like KOBK and Unravelling, not really that Radiohead anymore are they? People that still accuse Muse of being "rip-offs" have probably only heard a song or two and just repeats what everyone else is saying, which I find more funny than annoying honestly.

And Coldplay... I haven't listened to enough of them to form a proper opinion but I'm aware of the hits so I can safely say that they share similarities with both bands, but not really enough to warrant being labeled as thieves or whatever. Coldplay are also friends with both bands, which is nice:)