bots can be prevented by some image verification like the one we have when we are logging in our accounts IMO.

That doesn't stop the bots, while it's very annoying for legit (Tor) users.

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There were no bots from the past few years but suddenly they just appeared and worsen the spam problem to this forum.

The money grabbing ICOs made bump bots a business (charging up to $1000 per thread per week).

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Should have some trials for these bots,if they cant verify the image for 3x they should be permanently banned immediately.

I've had captchas that took me longer than that to solve.