yeah i had a very close call with a canadian eta/esta flying from china. being an aussie i didn't expect i'd need one but being in china the great firewall broke the canadian website that informs you about it. had to apply for it at the airport counter and would've missed the flight had it not been delayed 15mins unexpectedly. singapore introduced something more lightweight that might be more to do with covid than the usual "visa that's not a visa" and it was almost instant and cost zilch