i think that in a free society, you should be able to sell the product you want to sell. but, you should give information of what you are selling to the customer.

if it has telemetry, then it is a tool the customer buys, that also has the function of listening and reporting to others, how it is being used.

you want to sell it - no problem. but tell the customer, "look, this is bugged, and it's going to tell me what you are doing. but it's a great product." anything with opt-out telemetry needs a big version of that warning on the top of the page.

personally i am not a buyer. but that's my preference.

And how would I know if you did it right or not?