This shouldn’t really make any difference. In lemmy it would appear as a normal reply notification once per thread.

Still an annoyance, i post on reddit and lemmy for years, to keep having to delete that reply for years to come could accumulate to a significant amount of time, and small segments of time wasted tend to add up

I’ll see if I can expand the bot, but I don’t want each reply to end up like a wall of text.

You could add the "about this bot" the line above it ( making a two lines message) but this could be cryptic and therefore off putting for new lemmy users (creating a bad impression of the platform).

That would defeat the purpose, as the discovery from mastodon would happen days/weeks/months after that thread was active.

When you reply the person you reply to still get notifications , lemmy "active" sort bumps posts when they get new comments (see docs) and anyway most of the time i assume people just read comments and don't respond, and the idea is to make lemmy more discoverable so after that they could visit lemmy and participate more actively.