Will the snapshot that is made of my ethereum EOS address be made on all EOS platforms? Or will developers create there own funds?
By 'other EOS platforms', I suppose you mean chains that may be forked from EOSIO on Github and launched by a team that is headed by a team other than Block.one.
If yes, then it is likely that other chains will honor the existing token holders while taking the snapshot of their mainnet. Although the token belonging to their chains may not be called EOS.
Examples of other chains that may be launched: https://www.evolutionos.com/ https://medium.com/wax-io/worldwide-asset-exchange-development-update-wax-platform-base-technology-selection-and-more-7f280b90a371