2 Years of Service
Nope. Both the examples you give are, usually, further down the line along the specific fetish.
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Is this BDSM? I would say no. But it's damn sexy and could very well lead to traveling further down the BDSM path. A simple blind fold or spanking or tying a person's hands behind there back with a silk scarf (or similar item) is probably were most people start. (Disclaimer: While these ideas may be written as if they are facts, they are totally my opinions on the subject and I have no empirical evidence on hand to back up these claims. But it makes sense to me.)
More examples... cuz they are fun!
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Yeah my examples might be a bit high, but you get the point.
So you cannot really say a fetish is a gateway because that makes all the other acts gateway as well, which doesn't make any sense