Hello people,

I just started today to get into bitcoin "core system", specially about the "Script" language which permit to insure that transaction are valide.
By this well made video : https://www.youtube.com/watch?v=4qz7XehSBCc
The man explain that :

• there is 5 standard script
• standard script are the one accepted mostly by miners
• Others custum homemade script are likely to never be accepted on a block

Which makes me wondering :

• If transaction script equals "smart contract" and miners don't accept "custom script", Bitcoin intrinsic value is kinda limitated right ?
• How can we know which miners or pool-mining accept custom script ?
• Is there a statistique about the acceptance of a custom script ? How calcul that !?
• Why miners don't accept non standard script !?