Why isnt the amount of ram in the "standard version" enough for 3 people to play VANILLA minecraft, man i am saddly paying for this and i dont get why the performance is so bad

This is traight up sad, like come on man, other services that host minecraft worlds for FREE have a better performance than this, my server will just crash after 10 minutes of 3 people playing inside it because the ram “is not enough” or the cpu is being “over stressed”. And they just suggest me to pay for the most expensive service they offer, like lets be honest VANILLA minecraft with 3 people should not be a problem, at this point i feel like this is just a scam that is trying to make me pay for their titan version, i expected more than this.