[Oni]

Is this game worth starting in 2021?

It would be a challenge, as the game's got 6 years of content behind it. It's a gacha as well, so not worth playing unless you know what you're getting into.

Spoiler:

Starter accounts do exist, for those that are hell-bent on obtaining a particular character.

I don't play Fate but I play Azur Lane. Been playing it for like a month now and it's amazing.

Azur's probably the most F2P-friendly gacha there is.