I'm oretty sure Twitter still allows this, but the API is crippled and this reflects the poor experience in custom clients. I used to use Twidere extensively, b

I'm oretty sure Twitter still allows this, but the API is crippled and this reflects the poor experience in custom clients. I used to use Twidere extensively, but it's been very limited for the last ~8 years or so. You could make it use private APIs by copying OAuth client id|secret from an official application. This would enable some features (notifications and polls, and higher rate limits). Later Twitter fixed that and also sent a DMCA, so Twidere had to remove the code that worked with said APIs.