I suspected as much 
And sure enough, using wget on my DO droplet also confirms:
xx@xx:~# wget https://vimeo.com/65107797
--2019-09-16 14:16:25--  https://vimeo.com/65107797
Resolving vimeo.com (vimeo.com)... 151.101.64.217, 151.101.192.217, 151.101.128.217, ...
Connecting to vimeo.com (vimeo.com)|151.101.64.217|:443... connected.
HTTP request sent, awaiting response... 403 Forbidden
2019-09-16 14:16:25 ERROR 403: Forbidden.
Whereas wget on my home PC works fine:
C:\Users\Rich>wget https://vimeo.com/65107797
--2019-09-16 15:16:56--  https://vimeo.com/65107797
Resolving vimeo.com (vimeo.com)... 151.101.64.217, 151.101.128.217, 151.101.192.217, ...
Connecting to vimeo.com (vimeo.com)|151.101.64.217|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 115631 (113K) [text/html]
Saving to: '65107797'
65107797         100%[=============>] 112.92K  --.-KB/s    in 0.07s
2019-09-16 15:16:57 (1.60 MB/s) - '65107797' saved [115631/115631]