If you didn’t buy the bike on financing you’d still have to pay the subscription if you wanted to use it as intended. Not sure why you’d consider the subscription an interest-like fee. The only criticism is if you stopped using the bike before you paid it off then yes you would be paying subscription fees for all the remaining months you never used.

For what it’s worth, according to the S-1 they stopped bundling the subscription as part of the bike financing in 2018, so people are just financing the bike alone now.