move subscribe code to execute file

[yaacovCR]

= makes no other changes
= paves the way for further changes

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[IvanGoncharov]

@yaacovCR Thanks a lot for doing it as a separate step 👍
Save a lot of effort during the review!
Changes look good once you remove the "positional test".
If you find that some popular libraries were using our "internal" functions please open a separate issue to discuss what to do and communicate with their authors.
Otherwise this PR is ready to be merge 👍