Personally I feel Thai and Lao are harder to tell apart (I've resorted to: Lao is more curvy, Thai uses more straight lines), and also how to tell apart Czech from Slovakian, or Danish from other Nordic languages. Of course there are other ways to tell where you are, and if you only rely on written language you will not become a great player.
I'd watch GeoRainbolt[1] and all the pros that play in his tournaments.
(They're busy commentating, and they're not dedicated GeoGuessr streamers. It's understandable.)
But even if they could, it will still be harder when it comes time to differentiate between Hindi / Gujarati / Marathi / Bangla etc, which is why I'm looking forward to it.
It’s quite trivial as a layman American who has lived in Scandinavia to tell Danish apart for Swedish (one immediate dead giveaway is usage of ø in Danish vs ö in Swedish). But apparently Danish and Norwegian in written form are almost indistinguishable, so reliance on cultural usage of words must be necessary
But yeah this is probably with the written language/static imagery so please ignore, move along. :)
Only Czech: ě, ř, ů
Only Slovak: ä, ľ, ô
Tamil is a completely distinct script.
Tamil is used in signs/boards in several southasian countries (Southern state of Tamilnadu and other southern states, Sri Lanka, Malaysia, Singapore). Particularly in Sri Lanka, due to its official language status, it is possible to to lead to ambiguity in GeoGuessr between India and Sri Lanka. Contextual clues can generally rule out Malaysia and Singapore. So, I can understand the ambiguity between Sri Lankan Tamil and Tamil used in India at script level, but Bangla and Tamil have such distinct scripts that there are simple heuristics you can use to disambiguate.
Example for visual comparison:
https://translate.google.co.in/?sl=auto&tl=ta&text=I%20love%...
https://translate.google.co.in/?sl=auto&tl=bn&text=I%20love%...
https://translate.google.co.in/?sl=auto&tl=si&text=I%20love%...