[tor-bugs] #33299 [Circumvention/BridgeDB]: Remove retired pluggable transports

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#33299: Remove retired pluggable transports
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     Reporter:  phw                     |      Owner:  phw
         Type:  task                    |     Status:  assigned
     Priority:  Medium                  |  Milestone:
    Component:  Circumvention/BridgeDB  |    Version:
     Severity:  Normal                  |   Keywords:  s30-o22a2
Actual Points:                          |  Parent ID:  #31279
       Points:  0.5                     |   Reviewer:
      Sponsor:  Sponsor30-can           |
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 BridgeDB still hands out obfs3, ScrambleSuit, and FTE bridges. Tor Browser
 no longer supports FTE (see #29319), so we should remove it. I suggest
 also removing obfs3 and ScrambleSuit because these transports don't offer
 anything that obfs4 doesn't already provide.

 As of today, BridgeDB knows about 1,316 bridges. Among these:
 * 31 support FTE. 29 of these wouldn't be handed out because they also
 support obfs4 (see #28655). The remaining two bridges run FTE/obfs3 and
 ScrambleSuit/obfs3/FTE.

 * 34 support ScrambleSuit. 32 of these also support obfs4 and only two
 don't. Instead, they run obfs3/ScrambleSuit and ScrambleSuit/obfs3/FTE.

 * 106 support obfs3. Only seven of these don't support obfs4.

 Considering the above, I think it's safe to retire FTE, ScrambleSuit, and
 obfs3.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33299>
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