There're lots of assumptions here.
1) There's a distinction in in the kind of exchange rate (interbank vs visa) between Point of Sales vs App exchange vs ATM withdrawal
2) Interbank rates are only enjoyed by the major currencies, the rest of not so major currencies go through Visa
I'm not so certain about all the above, to my knowledge, because it isn't stated anywhere by Revolut that it's using Visa rate. The inference to visa rate, is probably because we are issued a visa card. Whereas it's stated explicitly by Revolut that it uses interbank rates and with little or no mention of visa/master rate. The language is obvious if we contrast it with Youtrip's.
If we read the Revolut legal terms and conditions, they use the same phrase "our Exchange Rate" for all kinds of currency exchanges, whether major minor currencies, point of sales, ATM, international transfer.... etc
It could just be marketing speak though. Interbank is marketing speak for interbank + visa.
Another reason why I tend to think only interbank rates (with or without markup) are used for all currencies and all mode of transaction, is because of their weekend mark up due to banks/markets closure.... if some transaction/currencies are using visa and others interbank rates, then there I think they will differentiate which currencies are subjected to the markup (those using interbank) and which aren't (those using visa). Because, to my understanding visa don't practice this weekend markup, at least not on the surface.
I may be wrong though.
But I think at a practical level, in the context of Revolut, interbank is better than mastercard/visa rate on most days, except maybe on weekends. And I would add, for all currencies.
So, is it safe and confirm to say that, if we do any 'point of sales' through vendor terminal with the card, do a direct sales conversion from SGD to MYR, it will be using visa rate instead of interbank rate listed in app?
Unless only when we change the funds and lock-in the rates internally via the app like USD / GBR / JPY to name a few, only then we get to enjoy the interbank rates listed in the app?
If that's really the case, then for Malaysia / Ringgit usage, using youtrip or revo wont make much of a diff... at most 0.01%+/- difference since it's just visa competing mastercard's rate..