(2) You can gather all your low inputs together in such a way that you can move them all with an appropriate fee.
(Compromises privacy since it links all those addresses together.)
No matter whether you include the input in a larger transaction, or create a transaction that uses the input all by itself, the input is still going to add at least 147 bytes to the transaction.
Since fees are calculated as satoshis
PER BYTE there is going to be a cost associated with getting it confirmed.
I think the viabtc accelerator requires that your transaction pay a fee of at least 10 satoshi per byte. That means that any UTXO valued at less than 0.00001470 BTC would cost more to spend than it is worth. Unless the typical fee for confirmation drops below 10 satoshi per byte, you'd be better off just abandoning the input than trying to spend it. It isn't even worth trying to include the UTXO as a fee for another transaction. You'd have to pay more in fees because of the additional input than the input supplies.
UTXO that are valued at exactly 0.00001470 BTC (or just slightly above) would probably be best to just spend entirely as a transaction fee (included in other transactions or not) which would at least eliminate them from the UTXO set and increase the miners reward a bit.
...
Yes, you are correct.
When I made that statement, I was thinking about low inputs, like around
0.0001 btc or more. In #3 I referenced "dust" but I intended higher than
"dust". In my second comment, I began talking about "dust" and UTXOs
with less than 1000 satoshis in the context you are referring to.
When I stated #2, I really meant combining low inputs (0.0001) with
higher inputs so that the higher inputs would carry the burden.
I wasn't specific enough with my terms and wording in #3 and intended
low input again, as opposed to "dust".
But yes, dust UTXOs are almost impossible to move currently, which is why
I proposed in my second comment the free relay/burn token conversion, only
as a way to lower the UTXOs.
I'm not a coder or in computer science so I don't use termonology correctly.
(Also I have a limited vocabulary in general, lol.)