I am not too familiar with Europe, but a remote job usually ties to a specific country, likely due to tax or some regulations. Another reason is that different country in the same continent has different cost of living and salary band, etc.

For some of these reasons, it might explain why while there is remote job in US or Canada or Mexico, there is no remote job for North America, the continent for these 3 countries. This might help explain why there isn't a remote job for Europe as it is a continent.

Haven't said this, it seems to be a great advantage for companies who can overcome the challenge and offer remote for Europe if it is an appealing offer.