I absolutely can't say anything about this shortener, just that I am currently using it and I got paid the first time. Will see how it goes.
tny.so PAYMENT PROOF from 25 of April 2021
@devnagy To be honest I don't recommend btc transaction this year. The bull market just don't let normal tx to pass without a big fee. To monitor the fees there are a lot of websites, who show you the stats, but it is useful only if you send or receive tx at times when the blocks are somehow empty. There are such times, but since you are not the one who control the time of the sending, but the shortener owner, to use btc is risky. The tx may get stuck in the mempool for weeks.