Jump throw binds are not prohibited across ESEA Pug servers/matchmaking and League. However, it is currently prohibited from use in any ESEA event that specifically states that the alias is banned.
If you have an alias in your config that resembles the following, you have a "Jumpthrow alias".
alias +jumpthrow "+jump;-attack"
alias -jumpthrow "-jump"
bind x +jumpthrow
If you'd like to participate in an event that specifically prohibits the use of "Jumpthrow aliases", remove this from your config.
Please keep in mind, this alias must be removed from your config, any autoexec config, and the key unbound (or bound to something different) to be completely removed. Individual key binds for any other actions are acceptable, it is the alias combining the two functions that is banned.