That mining service will start sending SegWit BTC after the 1st of August on my "1example123" address.
Lets say they send me, in August, 0.1 SegWit BTC.
Until I make a decision, I can :
*End up with 0.5 BTC on my "1example123" Bitcoin Core Wallet + 0.1 BTC on my "1example123" Bitcoin SegWit Wallet
or
*End up with 0.6 BTC on my "1example123" Bitcoin SegWit Wallet
the address is able to work on both chains.....0.5 on one and 0.5 on another....
but
you must control the wallet (have access to private keys) which might not be the case if you using some web wallet or exchange
for sure if you make a transaction after the fork/split if there is one...the transaction will go on the "mainstream" chain whichever it is...
and you if you decided to abandon the other chain....that's it...you're on the majority chain...
however if you don't have the control of your wallet and the service you're using decides to use the non-majority chain.....and abandon or keep for themselves the other coins (majority chain)...then that's your outcome as you don't have the control of your wallet.
anyone pls correct me if I'm wrong.