wwzsocki is gave the answer to your questions, and this service is obviously not something that should create problems with your twitter account. But every user is a story for themselves, Twitter can ban any account, any time without any explanation.

Maybe you can try to open thread for Twitter following, where you post your Twitter link and others post theirs, in that way you follow each others. Other way is take joniboini advice, people will not follow you just like that (some will do that, but will also unfollow you).

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Thanks for info, maybe I will try that service. I check your Twitter account and you currently have 3732 followers, so you lost significant number from those 5000 followers. But this is something quite common on Twitter, some people just unffolow you, and some accounts get deleted. I also lost some 500 followers during crypto winter, but I have not been too active on Twitter over the past year.